If an object moves 28 feet every 16 seconds and 7 feet every 4 seconds, what is the object's speed?

Answers

Answer 1

Answer: the object is going about 1.75 feet per second :)

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An electric refrigerator rated 400 W operates 8 hours a day. Find the energy used per day in KWh.

Answers

400 watts = 0.4 kw

(0.4 kw) x (8 hours) = 3.2 kw-hours

Name three situations in which force is created. describe the cause of the force in each situation

Answers

One situation in which force is created is when an object is moving and a force is created to stop that movement. Second situation is when an object is moving circularly and a force is created to move it towards the middle of the circle. The third situation is when a force is created that goes in the same direction as an object that is in movement.

The four terrestrial planets that have solid, rocky surfaces are A. Mars, Venus, Earth, and Jupiter.
B. Mercury, Jupiter, Saturn, and Mars.
C. Mercury, Venus, Jupiter, and Mars.
D. Mercury, Venus, Earth, and Mars

Answers

The four terrestrial planets that hace solid, rocky surfaces are (D.) Mercury, Venus, Earth, and Mars.

Check out pages 804-808 in the Glencoe Earth Science textbook provided by PennFoster. That way you can learn about the answer. :)

A person drops a brick from the top of a building. The height of the building is 400 m and the mass of the brick is 2.00 kg. What will be the speed of the brick right before it touches the ground? Use g=10.0 m/s^2.

Answers

This question involves the conservation of energy. There are two energy in this case, potential energy and kinetic energy. Let's divid the energy into three status.
1. Before dropping, all potential energy
2.dropping, potential energy transformed to kinetic energy
3. before hitting the ground, all Kinetic energy.

Recall the formula for both energy, which are U=mgh, and K=1/2mv^2

Since the energy is conserved in this case ( b/c otherwise it will say in the problem), the amount of energy at the beginning should equal to the energy at the end. Therefore we have, mgh=1/2mv^2

plug the number in and solve for velocity.

2x400x10=1/2 x 2 x v^2
v^2=8000
v= $√(8000)$
v=40 $√(5)$

A monkey is sitting on a tree when it sees a hunter claiming a near by tree. The Hunter is aiming directly at the head of the monkey.The money jumps out of the tree at the exact same time the arrow is released from the hunters bow.

Assume the Hunter has perfect aim, the monkey has zero reaction time and that air resistance is negligible.

Explain wether the monkey will avoid bring struck by the arrow.

Answers

yes as the speed or velocity of gun's bullet is very higher than the monkey so struck by the arrow

a ball is thrown upward at 25 m/s from the ground. what is the average velocity and average speed of the ball after 5 seconds?

Answers

When the ball reaches the highest point, its velocity will be zero. So final velocity is v=0m/s
Here, the time to reach highest point is equal to time to hit ground from highest point.
Consider upward motion, the acceleration of the ball is a=−g=−9.8m/s
2
(minus for motion opposite to gravity)
If t be the required time.
Using v=u+at,
0=25+(−9.8)t
⟹ t=2.5s
Thus the ball hits the ground after 2.5 seconds after reaching its highest point.

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