How much kinetic energy does a 7.2-kg dog need to make a vertical jump of 1.2 m? the acceleration due to gravity is 9.8m / s^2

Answers

Answer 1

Answer: $E_k=mgh\n\nm=7.2\ kg\n\ng=9.8\ m/s^2\n\nh=1.2\ m\n\nE_k=7.2\cdot9.8\cdot1.2=84.672\ \left[(kgm^2)/(s^2)\right]=84.672\ [J]$

Answer 2

Answer: Assuming that no energy is wasted,
Use the equation Gpe=mgh
Mass*gravity*height
1.2*7.2*9.8=
84.672
(The answer might be wrong I did it in my head)

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Diffusion is the net movement of particles from a region of higher concentration to a region of low concentration, due to their kinetic energy, down a concentration gradient. A)True B)False

Answers

Answer:

False

Explanation:

NOT due to their kinetic energy

S-waves can travel through either rock or water.
a. True
b. False

Answers

The statement ‘S-waves can travel through either rock or water’ is true. The answer is letter A. the S waves can pass to both rock and water because the distances between their molecules is shorter compared to air. That is why, when a wave passes through them, the vibration of energy can be easily transported.

An engineer in India (standard household voltage = 220 volts) is designing a transformer for use on herupcoming trip to Canada (standard household voltage = 120 volts). If her input coil has 240 turns, how many
turns should her output coil have?

Answers

he should a step-up transformer with k=220/120=1.83 so output coil must have 240*1.83=440 turns

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.What change would enable Gazala to pick up eight paper clips?

A) reversing the battery
B) reversing the nail and using the nail’s head
C) wrapping the wire around the nail more times
D) unwrapping several loops of the wire from the nail

Answers

Answer:

The correct answer is C.

Explanation:

To pick up four clips at the tip of the nail, wrap the wire around the nail more times than it already has. This is because the attraction force of the electromagnet is directly proportional to the square of the magnetic field that is generated by passing a current through the coiled wire. The magnetic field, in turn, is proportional to the number of turns that this wire has around the magnetic element, so it is necessary to increase the number of turns so that the strength of the electromagnet is greater.

Have a nice day!

C) wrapping the wire around the nail more times would enable Gazala to pick up eight more clips

What happens to a mirror when a ray is directed at it

Answers

Nothing happens to the mirror.

However, if the ray is within some suitable range of
wavelengths, the ray is reflected from the mirror's surface.

How is sun related to nuclear, electromagnetic, and heat energy?

Answers

Answer;

The sun creates energy through nuclear fusion. Kinetic energy creates heat and light.

Explanation;

Solar energy from the sun is the primary source of energy on the surface of life that is important for sustaining life on earth.
Nuclear fusion occurring in the sun involves a nuclear reaction in which hydrogen nuclei fuse together to form helium nuclei and release energy.
Electromagnetic energy from the sun comes to Earth in the form of radiation. This energy travels through space at a speed equivalent to that of other electromagnetic radiations that is the speed of light.
The electromagnetic energy from nuclear fusion in the sun generates kinetic energy that in turn creates light and heat.

The nuclear energy is the source of energy production on the sun, then this travels to the Earth in the form of Electromagnetic radiation and as it heats up the other bodies in solar system, it gets converted into the heat energy.

Explanation:

The sun is considered to be the ultimate source of energy for the whole solar system. The energy produced in the sun reaches all the other planets in the solar system. The sunlight is a very big source of energy for the Earth also.

The energy produced on the sun is due to the nuclear reaction due to the immense pressure and temperature. This nuclear energy from the sun travels to the other bodies in the solar system by means of the electromagnetic radiations.

The electromagnetic radiations from the sun carry the heat energy to the bodies and as they reach the target, the target is heated up due to the conversion of the energy from the sun into the heat energy.

Thus, The nuclear energy is the source of energy production on the sun, then this travels to the Earth in the form of Electromagnetic radiation and as it heats up the other bodies in solar system, it gets converted into the heat energy.

Learn More:

1. Acceleration of the box under friction brainly.com/question/7031524

2. The kinetic energy of an object depends on the brainly.com/question/137098

3. The approximate time taken to walk for 2000 miles brainly.com/question/3785992

Answer Details:

Grade: High School

Subject: Physics

Chapter: Energy

Keywords:

sun, energy, nuclear, electromagnetic, heat, nuclear reaction, immense, pressure, temperature, source, solar system, planets.

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