Answer:
what y'all teachers be on
Luke stands on the edge of a roof throws a ball downward. It strikes the ground with 100J of kinetic energy. Luke now throws another identical ball upward with the same initial speed, and this too falls to the ground. Neglecting air resistance, the second ball hits the ground with kinetic energy of____J
A) Less than 100
B) 100
C) 200
D) More than 200
A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)
3.9 m
4.0 m
39.2 m
40.0 m
Answer:
B
Explanation:
A car travels for 50mph for 5 hours, then for 30mph for another 3 hours in the same direction. What is the average speed the motorcycle traveled?
Answer:
42.5mph
Explanation:
The computation of the average speed is shown below:
As we know that
Speed = Distance ÷ Time
ANd, distance = Speed × time
So, the distance would be
= (50 × 5 hours) + (30 × 3)
= 250 + 90
= 340 miles
And, the total time taken is 8 hours
So, the average speed is
= 340 miles ÷ 8 hours
= 42.5mph
An object with a mass of 5kg is accelerated at
10 m/s^2. Determine the net force on the object.
Answer:
The net force is 50 Newton
Explanation:
Mechanical Force
According to Newton's second law, the net force exerted by an external agent on an object of mass m is:
F=m.a
Where a is the acceleration produced on the object.
We are given the mass of the object m=5 kg and its acceleration [tex]a=10\ m/s^2[/tex].
The net force is:
F = 5 * 10
F = 50 N
The net force is 50 Newton
A roller coaster has a velocity of 25 m/s at the bottom of the first hill. How high was the hill?
PLEASE HELP
Answer:
The height of the hill is "31.85 m".
Explanation:
The given value is:
Velocity,
v = 25 m/s
As we know,
⇒ [tex]Kinetic \ energy =Potential \ energy[/tex]
i.e,
⇒ [tex]mgh=\frac{1}{2} mv^2[/tex]
⇒ [tex]gh=\frac{1}{2} v^2[/tex]
⇒ [tex]h=\frac{v^2}{2g}[/tex]
On substituting the given value, we get
⇒ [tex]h=\frac{(25)^2}{2\times 9.81}[/tex]
⇒ [tex]=\frac{625}{19.62}[/tex]
⇒ [tex]=31.85 \ m[/tex]
Given;
Velocity, v = 25 m/sWe know the relation,
→ [tex]Kinetic \ energy (K.E) = Potential \ energy (P.E)[/tex]
or,
→ [tex]mgh = \frac{1}{2}mv^2[/tex]
or,
→ [tex]gh = \frac{1}{2}v^2[/tex]
[tex]h = \frac{v^2}{2g}[/tex]
By putting the values, we get
[tex]= \frac{(25)^2}{2\times 9.81}[/tex]
[tex]= \frac{625}{19.62}[/tex]
[tex]= 31.85 \ m[/tex]
Thus the response above is right.
Learn more about velocity here:
https://brainly.com/question/15447166
Which electromagnetic waves have the shortest wavelength and the highest frequency?
Gamma rays
each section of the electromagnetic spectrum has characteristics energy level, wavelength and frequencies association with it's photons
How long does it take an object to travel 375 m at a rate of 25 m/s?
Answer:
15s
Explanation:
Given parameters:
Distance traveled = 375m
Speed = 25m/s
Unknown:
Time taken = ?
Solution:
To solve this problem, we make time the subject of the speed equation.
Speed = [tex]\frac{distance}{time}[/tex]
Time = [tex]\frac{distance}{speed}[/tex]
Now insert the parameters and solve;
Time = [tex]\frac{375}{25}[/tex] = 15s
PLEASE HELP!! A 2.0 kg moving cart hits a spring with a spring constant 50.0 N/m. Assume the system is frictionless. When the cart has come to rest, how far has the spring compressed?
Explanation:
A spring has a spring constant, (k), of 3 N/m. It is stretched until it is extended by 50 cm. Calculate the elastic potential energy stored by the spring, assuming it is not stretched beyond the limit of proportionality.
First convert centimetres to metres:
50 cm = 50 ÷ 100 = 0.5 m
Then calculate using the values in the question:
Ee=12 k e2
Ee=12×3×0.52
Ee=1.5×0.25
Ee=0.375 J
An object on Earth (g = 9.8 m/s^2) has a weight of 62 N.
1) What is the mass of the object on Earth?
2) What is the mass of the object on Mars?
3) What is the weight of the object on Mars?
(g = 3.7 m/s^2)
Answer:
See the answer below
Explanation:
The weight of a body is defined as the product of mass by the acceleration gravitation of space or place.
1)
[tex]W=m*g[/tex]
where:
m = mass [kg]
g = gravity acceleration = 9.8 [m/s²]
Therefore:
[tex]m=W/g\\m=62/9.8\\m=6.32[kg][/tex]
2)
The mass remains the same regardless of where the object or body is located. That is, the mass will be equal on Mars and on Earth.
3)
We used the same equation to determine the weight, using the Mars gravity constant.
[tex]W=6.32*3.7\\W=23.4[N][/tex]
Force is a push or pull that causes an object to change speed change direction or to change ___ or _____.
Answer:
acceleration or velocity
Explanation:
SHORT ANSWER TYPE QUESTIONS
1 1. Why school bags have broad shoulder straps ?
Which of the following would reduce wind erosion
Limiting irrigation
Cutting down trees
Planting vegetation
Clearing away dead leaves
HELPP!!!
1)Explain how a diode could be used to convert a.c. to d.c., and suggest one disadvantage of this.
2) Some energy is always transferred to the surroundings when a current flows through a wire.
a) How is this energy transferred?
b) Is this energy always wasted energy? Explain your answer.
3) You can induce an electric current in a wire by moving a magnet relative to the coil.
A) Describe two different ways in which you can increase the size of the induced current.
B) Describe how you can reverse the direction of the induced current.
Try to split the questions for easy access
PLEASEEE HEPPP!!!!!
Which material would result in the greatest amount of energy transfer?
An absorber that is dark in color and rough.
A reflector that is dark in color and smooth.
An absorber that is light in color and rough.
A reflector that is light in color and smooth.
Answer:
A. The first option: An absorber that is dark in color and rough.
Explanation:
a material absorbs - or transfers the most thermal energy when it is dark in color and rough in texture.
The material that would result in the greatest amount of energy transfer will be an absorber that is dark in color and rough.
What is an absorber?A piece of a substance called an absorber is used to absorb a few of the energy of an incoming particle.
Depending on the application, absorbers can be manufactured of a range of materials, including lead, tungsten, and liquid hydrogen.
The majority of absorbers are found in particle detectors, but they are also utilized in particle accelerators to protect their components from radiation damage.
The material that would result in the greatest amount of energy transfer will be an absorber that is dark in color and rough.
Hence option A is correct.
To learn more about the absorber refer to the link;
https://brainly.com/question/23461193
A football is thrown due north across a 40 meter river and it takes 2 seconds to cover that distance.
10. What is the speed of the football in meters per second?
11. What is the velocity of the football in meters per second?
HELP DUE TODAY!!
Answer:
I. Speed = 20m/s
II. Velocity = 20m/s due North.
Explanation:
Given the following data;
Distance = 40m
Time = 2secs
To find the speed;
Mathematically, speed is given by the formula;
[tex]Speed = \frac{distance}{time}[/tex]
Substituting into the equation, we have;
[tex]Speed = \frac{40}{2}[/tex]
Speed = 20m/s.
In physics, we use the same formula for calculating speed and velocity. The only difference is that speed is a scalar quantity and as such has magnitude but no direction while velocity is a vector quantity and as such it has both magnitude and direction.
[tex]Velocity = \frac{distance}{time}[/tex]
Therefore, the velocity is 20m/s due North.
A box is pulled with a force of 25 N to produce a displacement of 15 m. If the
angle between the force and displacement is 30°, find the work done by the force.
Answer:
324.76J
Explanation:
Given parameters:
Force of pull on the box = 25N
Displacement = 15m
Angle of pull = 30°
Unknown:
Work done by the force = ?
Solution:
Work done is the force applied on a body to move it through a particular distance.
It can be expressed as;
Work done = F x dcosФ
F is the force
d is the displacement
Ф is the angle
So;
Work done = 25 x 15cos 30 = 324.76J
Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. A scientist who wants to date materials older than 40,000 years would most likely use which radioisotope? uranium-238 rubidium-91 iodine-131 cobalt-60
Answer:
the only one of these materials that allows studying processes of a very long period of time is Uranium 238
Explanation:
In a radioactive material, half of the atoms decay each life period, in carbon 14 this period T = 5730 years, so for a time of 40,000 years there are 7 life periods, so there are very few atoms left without decomposing .
To study older samples, materials with a longer life period are needed, let's show the visa time
²³⁸U T= 4.5 10¹⁰ years
⁹¹Rb T = 58 s
¹³¹I T= 8.04 days
⁶⁰Co T= 5.27 years
Therefore, the only one of these materials that allows studying processes of a very long period of time is Uranium 238
Answer:
A) Uranium-238 is the correct answer.
state Newton law of gravity
Answer:
Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.
Explanation:
A cube-shaped piece of copper has sides of 4cm each and it's density is
2.7 g.cm^3. What is the VOLUME of the piece of copper? *
O 12 cm^3
O 64 cm^3
8 cm^3
O 6.7 cm^3
Answer:
[tex]64 cm^3[/tex]
Explanation:
Density
The density of a substance is the mass per unit volume. The density varies with temperature and pressure.
The formula to calculate the density of a substance of mass (m) and volume (V) is:
[tex]\displaystyle \rho=\frac{m}{V}[/tex]
We have a cube-shaped piece of copper of 4 cm of side length. The volume of the piece is:
[tex]V=(4\ cm)^3=64\ cm^3[/tex]
Surprisingly, no other magnitude is required, thus the answer is:
[tex]\mathbf{64 cm^3}[/tex]
the air flowing over a roof top has a high velocity compared to that flowing underneath. EXPLAIN.
please help me
Answer:
When a fluid flows into a narrower channel, its speed increases. That means its kinetic energy also increases. Where does that change in kinetic energy come from? The increased kinetic energy comes from the net work done on the fluid to push it into the channel and the work done on the fluid by the gravitational force, if the fluid changes vertical position. Recall the work-energy theorem,
There is a pressure difference when the channel narrows. This pressure difference results in a net force on the fluid: recall that pressure times area equals force. The net work done increases the fluid’s kinetic energy. As a result, the pressure will drop in a rapidly-moving fluid, whether or not the fluid is confined to a tube.
There are a number of common examples of pressure dropping in rapidly-moving fluids. Shower curtains have a disagreeable habit of bulging into the shower stall when the shower is on. The high-velocity stream of water and air creates a region of lower pressure inside the shower, and standard atmospheric pressure on the other side. The pressure difference results in a net force inward pushing the curtain in. You may also have noticed that when passing a truck on the highway, your car tends to veer toward it. The reason is the same—the high velocity of the air between the car and the truck creates a region of lower pressure, and the vehicles are pushed together by greater pressure on the outside. This effect was observed as far back as the mid-1800s, when it was found that trains passing in opposite directions tipped precariously toward one another.
Explanation:
I Hope it help mark as Brainlist ↘The air flowing over a roof top which has a high velocity as compared to that flowing underneath. This is because of the increase in the kinetic energy of the air.
What is Kinetic energy?Kinetic energy is the energy which is due to the motion of an object. It is the energy which is present inside the body of an object which is in motion. Kinetic energy undergoes transformation to potential energy when the object comes at rest. The SI unit of Kinetic energy is Joule (J). Kinetic energy is a vector quantity as it has both the magnitude and direction.
When a fluid or other substances such as air flows into a narrower channel, the speed or velocity of the compound increases. This means that the kinetic energy of the substance also increases. This is because, kinetic energy is directly proportional to the velocity of the object.
Learn more about Kinetic energy here:
https://brainly.com/question/26472013
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Light travels at a constant 3.0x10^8m/s.
If the moon is 3.84x108 meters from the earth, how much time would it take the light from the moon to reach the earth?
Answer:
mulitipy the numbers and u will get the answer!!
A plane was traveling from Florida to Montreal. It flew for 4 hours and went 1,895 miles. What was its speed?
Answer:
473.8miles/hr
Explanation:
Given parameters:
Time of flight = 4hrs
Distance traveled = 1895miles
Unknown:
Speed of the plane = ?
Solution:
Speed is the rate of distance covered per unit of time.
It is expressed as:
Speed = [tex]\frac{distance}{time}[/tex]
So;
Speed = [tex]\frac{1895}{4}[/tex] = 473.8miles/hr
Why do hot spots form a “chain of volcanoes?
because earth has lava underneath us all and it makes earthquakes and etc things like that
Im struggling on my physics work about velocity
Answer:
53.8
Explanation:
Knowns:
Distance - 1,400
Speed - 52
Unknowns:
Velocity - ?
V = 2([tex]\frac{Distance}{Time}[/tex])
V = 2([tex]\frac{1,400}{52}[/tex])
V = 2(26.9)
V = 53.8
Four model rockets are launched in a field. The mass of each rocket and the net force acting on it when it launches are given in the table below. (1. 4.25kg 120N) (2. 3.25kg 120N) (3. 5.50kg 120N) (4. 4.50kg 120N), Which rocket has the highest acceleration?
Answer:
Rocket 2 has highest acceleration.
Explanation:
Net force,
F = mass (m) × acceleration (a)
We have,
m₁ = 4.25 kg and F = 120 N
[tex]a_1=\dfrac{F_1}{m_1}\\\\a_1=\dfrac{120}{4.25}\\\\a_1=28.23\ m/s^2[/tex]
m₂ = 3.25 kg, F₂ = 120 N
[tex]a_2=\dfrac{F_2}{m_2}\\\\a_2=\dfrac{120}{3.25}\\\\a_2=36.92\ m/s^2[/tex]
m₃ = 5.5 kg, F₃ = 120 N
[tex]a_3=\dfrac{F_3}{m_3}\\\\a_3=\dfrac{120}{5.5}\\\\a_3=21.81\ m/s^2[/tex]
m₄ = 4.5 kg, F₄ = 120 N
[tex]a_4=\dfrac{F_4}{m_4}\\\\a_4=\dfrac{120}{4.5}\\\\a_4=26.66\ m/s^2[/tex]
Hence, it can be seen that the highest acceleration is of rocket 2.
PLEASE ANSWER MY QUESTION
Answer:
a) 4
b) 5
c) 2s
d) 10 m/s
e) 5-10m/s^2
want to zøom?
Jermaine runs exactly 2 laps around a 400 meter track. At the beginning of her run the clock read 3:02:00 PM. At the end her clock read 3:04:45 PM. Find the distance (d) the person traveled. calculate the speed using distance and total time. find the displacement. calculate the velocity. HELP
Explanation:
Given parameters:
Jermaine runs exactly 2 laps around a 400m track
Start time = 3:02:00PM
End time = 3:04:45PM
Unknown:
Distance traveled = ?
Speed = ?
Displacement = ?
Velocity = ?
Solution:
To solve this problem, we need to find the distance and time first;
Distance = 2 x 400 = 800m
Time taken = 3:04:45PM - 3:02:00PM = 165s
Speed = [tex]\frac{distance}{time}[/tex] = [tex]\frac{800}{165 }[/tex] = 4.85m/s
The velocity of the body is 0m/s and so is the displacement.
This is because the starting and finishing position of the Jermaine is the same.
Type of mirror used as a side mirror on a vehicle to provide a wide angle view...
Answer:
yes done first thing tomorrow
Answer:
convex mirror is used in vehicle to provide a wide angle view
Ian and Dane are twins. Ian loves art and music and work after school. Dane loves sports and would do anything to avoid having a job. This is an example of how development is:
Answer:
Explanation:
Pliability
The swimmer swims in a straight line in the pool. Her motion is shown on the following graph of position 2
VS. time t.
*(m)
2
10
12
