Answer:
20N
Explanation:
10×2
Answer:
Answer:
20N
Explanation:
10×2
I drop an egg from a certain distance and it takes the egg 3.74 seconds to reach the ground. How high up was the egg?
Answer:
The height from which the egg is dropped is 68.54 m.
Explanation:
Given:
Initial velocity of egg is, [tex]u=0\ m/s[/tex](Dropped means initial velocity is 0)
Time taken is, [tex]t=3.74\ s[/tex]
Acceleration experienced by egg is due to gravity, [tex]a=g=9.8\ m/s^2[/tex]
The height from which the egg is dropped is, [tex]d=?[/tex]
Now, we use Newton's equation of motion that relates the distance, initial velocity, time and acceleration.
So, we have the following equation of motion:
[tex]d=ut+\frac{1}{2}at^2[/tex]
Plug in all the given values and solve for 'd'. This gives,
[tex]d=0+\frac{1}{2}\times 9.8\times (3.74)^2\\\\d=\frac{1\times 9.8\times 13.9876}{2}\\\\d=\frac{137.078}{2}\\\\d=68.54\ m[/tex]
Therefore, the height from which the egg is dropped is 68.54 m.
Justine is ice-skating at the Lloyd Center. What is her final velocity if she accelerates at a rate of 2.0 m/s for 3.5 seconds?
Answer:
7 m/s
Explanation:
Acceleration, [tex]a=\frac {v-u}{t}[/tex]
Where v and u are the final and initial velocities of the Justine respectively, t is the time taken for Justin to attain final velocity.
Making v the subject then
v=at+u
Taking u as zero then
Substituting 3.5 for t, 2 as a then
v=3.5*2=7 m/s
A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2cm away from the source? Calculate
a. The wavelength
b. The frequency
c. The wave speed
Answer:
The wavelength will be 4 cm, frequency will be 4.66 Hz and wave speed is 18.6 cm/sec
Explanation:
Given:
No. of crest = 13
No. of trough = 15
Time = 3 seconds
Hence, 1 crest or 1 trough = [tex]\frac{1}{2}\lambda[/tex]
therefore,
13 C + 15 T = [tex]28(\frac{1}{2}\lambda)[/tex]
=[tex]14\lambda[/tex]
Time given 3 seconds
= [tex]\frac{3}{14}s[/tex]
[tex]\nu= \frac{14}{3}[/tex]
[tex]\nu= 4.6 Hz \approx 5 Hz[/tex]
2 cm distance is travelled is time period
[tex]\lambda = 4 cm[/tex]
Again wave will travel in 1 T = 4 cm
wave speed v =[tex]\lambda\times\nu[/tex]
= [tex]4\times\frac{14}{3}[/tex]
= 18.6 cm/s
AAAAAAAAAH
Heat will flow from object A to object B if:
1 The molecular average kinetic energy of the two objects is the same.
2 The molecular average kinetic energy of A is higher than that of B.
3 The molecular average kinetic energy of B is higher than that of A.
I only
II only
I and III
III only
Answer:
l and lll
Explanation:
Answer:
II only
Explanation:
For heat to flow from one object to another, there must be a temperature difference between them. Temperature is a measure hotness or coldness of an object or a body.
An object consists of vibrating molecules, thus molecular kinetic energy. The measure of the average kinetic energy of an object is its temperature. Thus, when object A has higher temperature (hotter) than B, heat would flow from A to B.
The thin, narrow structure of the capillaries is well-suited to their function because the capillaries _____.
1. Only carry the liquid portion of blood
2. Transport substances directly to the body cells
3. Require only a small amount of oxygen to function
4. Have the opposite function of arteries and veins
I NEED HELP BADLY
While driving her car at 40 m/s, Andrea (with a mass of 50-kg) stops short to avoid hitting a squirrel crossing the road. If the seat belt is in contact with Andrea for 0.5 seconds, determine:
a.) Andrea’s initial momentum
b.) Andrea’s final momentum
c.) What is the change in momentum (impulse)?
d.) What is the force that the seatbelt exerts on Andrea?
Answer:
a) Andrea's initial momentum, 200 kg m/s
b) Andrea's final momentum, 0
c) Impulse, = - 200 Ns
d) The force that the seat belt exerts on Andrea, - 400 N
Explanation:
Given data,
The initial velocity of the car is, u = 40 m/s
The mass of Andrea, m = 50 kg
The time period of deceleration, a = 0.5 s
The final velocity of the car, v = 0
a) Andrea's initial momentum,
p = mu
= 50 x 40
= 200 kg m/s
b) Andrea's final momentum
P = mv
= 50 x 0
= 0 kg m/s
c) Impulse
I = mv - mu
= 0 - 200
= - 200 Ns
The negative sign indicated that the momentum is decreased.
d) The force that the seat belt exerts on Andrea
F = (mv - mu)t
= (0 - 200) / 0.5
= - 400 Ns
Hence,the force that the seat belt exerts on Andrea is, - 400 N
Neutrons released in a fission reaction can strike other nuclei and cause ______.
Question 16 options:
fusion reactions
chain reactions
radioactive decay
an electron avalanche
Chain reactions
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions
Explanation:
In nuclear fission reactions, the heavier atoms split into into lighter atoms, releasing neutrons at high velocity in the process. The neutrons hit other heavier atoms in the vicinity and split them too releasing more neutrons. This continuation is called chain reaction. The more the released neutrons the higher the rate of chain reactions. This causes too much energy to be produced at a go until an enormous explosion occurs (like in bombs).
In controlled nuclear fission such as in nuclear reactors, the number of neutrons is controlled so as to prevent the reactor from exploding. A wall that absorbs excess neutrons is used to control the number of chain reactions to prevent the release of too much energy at once.
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Final answer:
Neutrons released in a fission reaction can cause chain reactions, which are sustained cycles of fission that release significant amounts of energy.
Explanation:
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions. This process begins when a neutron collides with a nucleus, such as uranium-235, causing it to split into two smaller isotopes and release additional neutrons. If these neutrons then collide with other uranium-235 atoms, they can cause further fission, perpetuating the cycle. A sustained nuclear chain reaction can lead to the release of large amounts of energy, which is the principle behind both nuclear power generation and the explosive power of nuclear weapons.
Which structures protect the cell? Check all that apply.
- cell wall
- cell membrane
- mitochondrion
- nucleus
- ribosome
- Golgi body
Answer:
cell wall and cell membrane
Answer:
Cell wall and Cell membrane.
Explanation:
The cell membrane controls what goes in and out of the cell
The greater the speed of speed gas particles in containers, the
Greater the collision
Explanation:
The greater the speed of gas particles in the containers, the greater the collision of gases with the container and between themselves.
The speed of gas molecules increases when their kinetic energy increases. This causes a surge in collision between the particles and the wall of the container. A gas is composed of large number of molecules moving at different speeds. When the temperature of gases are increased, they gain more kinetic energy and their speed will increase. This leads to an increase in effective collision between gas particles.Learn more:
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you push a book a distance of 5 meters with a force of 10 newtons for 2 seconds how much work did you do on the book
Answer:
50 J
Explanation:
Work, W=Fd where F is the applied force and d is the distance
Substituting 10 N for F and 5 m for d then work done on the book can be expressed as
W=10 N* 5 m=50 Nm= 50 J
Therefore, the work done is equivalent to 50 J
If 10 calories of energy are added to 2 grams of ice at -30° C, calculate the final temperature of the ice. (Notice that the specific heat of ice is different from that of water.) T.F =
-20° C
-30° C
30° C
40° C
Answer:
-20°C
Explanation:
ΔQ = m c Δt
here ΔQ is heat supplied which is 10 calories , m is mass which is 2 g , c is specific heat capacity of ice which is 0.5 cal/(g C°), Δt is change in temperature which here is to be calculated.
re arranging the equation we get
Δt = ΔQ/(mc)
= 10/ ( 2 × 0.5)
= 10/1
= 10 C°
final temperature = -30 +10 = -20°C
hence option is A
Is the net force up 0.2 N and down 3 N balanced or not blanced
Answer:
Not balanced
Explanation:
The force pulling the object up is applying less force than the object pulling down, this means the object will move down
Answer:
Not balanced
Explanation:
we can see our face clearly on mirror why cant we see our face clear on aluminium or irion plate
I need at least 5 sentence
Because specular reflection occurs with a mirror, while diffuse reflection occurs with aluminium or iron plate
Explanation:
Reflection is a phenomenon typical of waves (such as light wave), that occurs when a wave bounces off the surface of a certain material, going back into the original medium at a certain angle, without changing speed, frequency or wavelength.
The direction of the reflected ray is given by the law of reflection, which states that:
The incoming ray, the reflected ray and the normal to the surface all lie on the same planeThe angle of incidence is equal to the angle of reflectionDepending on the type of surface, two different types of reflection can occur:
Specular reflection: this occurs when the surface is perfectly smooth. In such a case, all the incoming rays of light hit the surface with same angle of incidence, therefore they are reflected at the same angle. This means that a perfect and clear image of the original object can be formed: this is the case of a mirror.Diffuse reflection: when the surface is not smooth, the imperfections on the surface are such that the incoming rays of light hit the surface at different angles of incidence. As a result, the rays are reflected at different angles to each other, and therefore no clear image of the object is produced. This is the case of aluminium or iron plate.Learn more about reflection and other wave phenomena:
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Which element is this?
Answer:Silicon
Explanation:
You add up the protons and neutrons and then look at the element paper
how to do this question
Answer:
64°
Explanation:
The triangle is an isosceles triangles (both legs are equal to the radius of the circle), so that means the base angles are the same.
Angles of a triangle add up to 180°, so:
128 + 2x = 180
2x = 52
x = 26
∠1 is complementary to the base angle, so:
∠1 = 90 − 26
∠1 = 64
What organism would be at the top of the energy pyramid
A) algae
B) barracuda
C) reef shark
D) snapper fish
An electric heater of 1000w is used for 2 hours a day. What is the cost for using in for a month of 28 days, if 1 unit costs 3.00 rupees.
Explanation:
total consumption in a month - 1000×2×28= 56000 w-hrs
1 unit = 1Kwh
total unit in month = 56000/1000 = 56
total cost = 56×3 = 168 rs
4. How many planets are there in our solar system?
a. 9
b. 8
c. 12
d. 15
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Since Pluto is a dwarf planet, the correct option is B. 8
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Which of the following is evidence that supports the particle model of light
Answer:
White light disperses into full spectrum of color when shined through a prism due to refraction.
Explanation:
This experiment was performed by Isaac Newton when he passed a white light through a glass prism.
A car has a velocity of 26 m/s and goes down to 8 m/s as it approaches traffic. Was the some sort of acceleration?
Your answer:
Yes
No
Maybe so
Answer:
Yes
Explanation:
This is negative acceleration, also known as deceleration where the speed is reduced from high to low at a specific duration.
how does earths movement through space impact the human experience
Answer:
In space, astronauts lose fluid volume—including up to 22% of their blood volume. Because it has less blood to pump, the heart will atrophy.Under the effects of the earth's gravity, blood and other body fluids are pulled towards the lower body.
Explanation:
A city is considering switching to geothermal power for their electricity needs. Which of the following is an advantage of this plan?
It is commonly used across the entire United States.
It uses less land area than gas power plants.
It uses water to power large turbines.
It in inexpensive to build.
It uses water to power large turbines.
Geothermal power taps on the energy of natural steam from the earth's lithosphere.
Explanation:
The heat from deep in the the lithosphere heats up underground water into high-pressure steam trapped in within the rocks. Boreholes are sunk to tap on the potential energy of this high-pressure steam to turn large dynamo turbines that convert the steam energy into electricity.
The biggest advantage, moreover, is the fact that this method of electricity generation does not emit greenhouse emissions as compared to gas plants that burn hydrocarbons that release CO₂.
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How does the gravity which pulls the moon and earth toward each other also affect the ocean?
the ocean creates tides accosiated with the ocean
A block of mass m = 75 kg is hanging on a vertical rope of length L = 12 m. What work is done by the
gravitational force when the block swings to a position where the rope makes an angle θ = 40° with
the vertical?
Answer:
2100 J
Explanation:
Draw a picture. Notice that the rope forms a triangle, where the hypotenuse is L and the height is L cos θ. The height of the mass is h. The total height is L, so:
L = h + L cos θ
h = L − L cos θ
The work done by gravity is force times distance:
W = mgh
W = mg (L − L cos θ)
W = (75 kg) (9.8 m/s²) (12 m − 12 m cos 40°)
W = 2063 J
Rounding to two significant figures, the work done is 2100 J.
A 68 kg rock climbers 320 m above the ground the sun is down or up at 1.5 m/s using the ground as a reference point determine the total mechanical energy of
Using the ground as a reference point the total mechanical energy of the rock climber is 213,621.15 J.
The total mechanical energy of the rock climber is the sum of its potential energy and kinetic energy. Potential energy is the energy an object has due to its position, while kinetic energy is the energy an object has due to its motion.
To calculate the potential energy, we can use the following formula:
PE = mgh
where:
PE is the potential energy (joules)
m is the mass of the object (kilograms)
g is the acceleration due to gravity (9.81 m/s²)
h is the height of the object above the ground (meters)
To calculate the kinetic energy, we can use the following formula:
KE = 1/2mv^2
where:
KE is the kinetic energy (joules)
m is the mass of the object (kilograms)
v is the velocity of the object (meters per second)
Plugging in the values, we get:
PE = (68 kg)(9.81 m/s²)(320 m) = 213,542.4 J
KE = 1/2(68 kg)(1.5 m/s)² = 78.75 J
Therefore, the total mechanical energy of the rock climber is:
ME = PE + KE = 213,542.4 J + 78.75 J = 213,621.15 J
So the answer is 213,621.15 J
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Complete question below:
A 68 kg rock climber is 320 meters above the ground and is moving upward at a speed of 1.5 m/s. Using the ground as a reference point, determine the total mechanical energy of the rock climber.
A copper sphere was moving at 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. If the specific heat capacity of copper is 387 J/(kg ⋅ C°), what was the increase in temperature?
0.23 C°
0.81 C°
1.3 C°
2.1 C°
Answer:
Temperature increase = 2.1 [C]
Explanation:
We need to identify the initial data of the problem.
v = velocity of the copper sphere = 40 [m/s]
Cp = heat capacity = 387 [J/kg*C]
The most important data given is the fact that when the shock occurs kinetic energy is transformed into thermal energy, therefore it will have to be:
[tex]E_{k}=Q\\ E_{k}= kinetic energy [J]\\Q=thermal energy [J]\\Re-employment values and equalizing equations\\\\\frac{1}{2} *m*v^{2}=m*C_{p}*dT \\The masses are canceled \\\\dT=\frac{v^{2}}{C_{p} *2} \\dT=2.1 [C][/tex]
The correct option is d. 2.1°C. The increase in temperature of the copper sphere was approximately [tex]\( 2.1 \)[/tex]°C, which corresponds to answer choice D).
Given:
- Initial kinetic energy (KE) of the copper sphere = [tex]\( \frac{1}{2} mv^2 \)[/tex]
- Specific heat capacity of copper, [tex]\( c = 387 \)[/tex] J/(kg·°C)
The entire kinetic energy is converted into thermal energy, [tex]\( Q = mc\Delta T \)[/tex], where [tex]\( \Delta T \)[/tex] is the increase in temperature.
1. Calculate the initial kinetic energy:
[tex]\[ KE = \frac{1}{2} mv^2 \][/tex]
2. Set up the equation equating kinetic energy to thermal energy:
[tex]\[ \frac{1}{2} mv^2 = mc\Delta T \][/tex]
3. Solve for [tex]\( \Delta T \)[/tex]:
[tex]\[ \Delta T = \frac{\frac{1}{2} mv^2}{mc} \][/tex]
4. Substitute the given values:
[tex]\[ \Delta T = \frac{\frac{1}{2} \times m \times (40)^2}{m \times 387} \][/tex]
5. Simplify the expression:
[tex]\[ \Delta T = \frac{800 \times m}{387 \times m} \]\[ \Delta T = \frac{800}{387} \]\[ \Delta T \approx 2.065 \ \textdegree C} \][/tex]
Rounding to one decimal place, the increase in temperature [tex]\( \Delta T \)[/tex] is approximately [tex]\( 2.1 \)[/tex]°C.
Therefore, the increase in temperature of the copper sphere was approximately [tex]\( 2.1 \)[/tex]°C, which corresponds to answer choice D).
A copper sphere was moving at 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. If the specific heat capacity of copper is 387 J/(kg ⋅ C°), what was the increase in temperature?
a. 0.23 C°
b. 0.81 C°
c. 1.3 C°
d. 2.1 C°
An object has a mass of 785 g and a volume of 15 cm³. What is its density? (Give your answer in g/cm³ to 2 decimal places).
Answer:
denisity = 52.33 g/c[tex]m^{3}[/tex]
Explanation:
Density:
[tex]d = \frac{m}{v}[/tex]
We have that m = 785 and that v = 15 c[tex]m^{3}[/tex].
[tex]d = \frac{785}{15}[/tex]
d = 52.33 [tex]m^{3}[/tex]
The density of the object, calculated using the formula Density = Mass/Volume with the given mass of 785g and volume of 15cm³, is found to be 52.33 g/cm³.
Explanation:The subject in question is about determining the density of an object, which falls under the area of Physics. In physics, density is defined as mass per unit volume, and the formula for calculating density is Density (ρ) = Mass (m)/Volume (V). In the SI system, we often use grams per cubic centimeter (g/cm³) to express the density of solids and liquids.
To apply the formula to this question, we take the mass of the object, which is given as 785g, and then divide this by the volume of the object, given as 15cm³. Thus, the calculation becomes: ρ = 785g / 15 cm³.
The calculated density, to 2 decimal places, is 52.33 g/cm³. Therefore, the object in question has a density of 52.33 g/cm³.
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> Science Sem 2 CR SHS1920
What can happen to solar radiation when it enters Earth's atmosphere? Select three options
It is absorbed by Earth.
It is reflected by clouds.
It is reflected by glacial ice.
It is condensed into visible light.
It is amplified by water molecules.
The following can happen to solar radiation when it enters Earth's atmosphere:
It is absorbed by Earth. It is reflected by clouds. It is reflected by glacial ice.Answer: Option A, B, and C
Explanation:
Solar radiation causes an abnormal effect in humans, if they are exposed directly. All the solar radiation emitted by the sun, does not hit us directly. The energy while reaching us passes through different levels of spheres.
Atmosphere contains nitrogen and oxygen molecules, which absorb some of the solar radiation. And some of it is reflected back by the clouds. And some of the remaining energy is absorbed by the surface of the earth. Likewise, almost 71% of the radiation is absorbed.
Answer: It is absorbed by Earth.
It is reflected by clouds.
It is reflected by glacial ice.
Explanation: Solar radiation is composed of electromagnetic waves that carry energy.
White or shiny surfaces usually reflect some waves (actually almost every surface reflects electromagnetic waves)
So some of the radiation is reflected by clouds or by glacial ice.
The bigest part is actually absorbed by Earth (this is why during the day the temperature increases, a biggest amount of radiation is being absorbed)
You push a loaded shopping cart 5 meters along the ground with a force of
200 N. What work have you done on it?
O A. 9,000 j
O B. 2,500 j
O C. 2003
O
D. 1,000 J
Answer:
D
Explanation:
Work done w = force F × distance d
F = 200N and d = 5m
: w = 200 × 5
w = 1000J
is potential energy a vector or scalar quantity
Answer:
Scalar Quantity
Explanation:
Scalar Quantity
Quantity whose magnitude alone is sufficient to represent it. We can also say that it is an amount that has magnitude but no direction. For example, temperature and volume are scalar quantities.
For this case we have the potential energy and it is defined by the equation:
[tex]E_{p}=m*g*h\\ where:\\m =mass [kg]\\g = gravity [m/s^2]\\h = height [m]\\[/tex]
The above equation only shows us one magnitude, it has no direction, therefore it is a scalar quantity.