PHYSICS HIGH SCHOOL

A light-year is about?

Answers

Answer 1
Answer: 13 year old and the light year mean  cell of moucles that can use simple year light diffusion

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HIGH SCHOOL

If two swimmers compete in a race, does the faster swimmer develop more power?

Answers

Power is equal to energy per unit time. In this case, power is proportional to energy while is inversely proportional to time,on the other hand. Given the two swimmers exerts same amount of energy but the faster swimmer just does things in faster time, then the faster swimmer should develop more power from shorter time
HIGH SCHOOL

Simon is riding a bike at 12 km/h away from his friend Keesha. He throws a ball at 5 km/h back to Keesha, who is standing still on the side walk. How fast would Keesha say the ball is traveling toward her?
A. 5 km/h
B. 7 km/h
C. 12 km/h
D. 17 km/h

Answers

7 km/h is the right answer
MIDDLE SCHOOL

A rock is thrown horizontally at a speed of 5 m/s front the top of a cliff 64.7 m high. The rock hits the ground 18 m from the base of the cliff. How would this distance change if the rock was thrown at 10 m/s?

Answers

The distance will be 36.0 m

Answer:

If the rock was thrown at 10.0 m/s, the rock would land twice as far from the cliff as it did previously.

Explanation:

sample answer on edge 2020

MIDDLE SCHOOL

What is responsible for the apparent motion of the Moon in the sky from East to West?

Answers

As a result, although the Moon is moving to the east relative to the stars, the much faster westward motion of the sky is carrying it to the west, so despite its eastward motion relative to the center of the Earth, it rises in the east and sets in the west, just like any other celestial body.


HIGH SCHOOL

When work is done on an object, the object gains energy. true or false

Answers

True. When work is done on an object, the object gains energy

Answer:

True

Explanation:

i took the quiz

HIGH SCHOOL

The element carbon (C) is most likely to form covalent bonds with the element beryllium (Be).
krypton (Kr).
selenium (Se).
sodium (Na).

Answers

Selenium is the right one
The answer would be : Selenium (Se).

Hope this helps !

Photon
MIDDLE SCHOOL

A mechanic uses a mechanical lift to raise a car. The car weighs 11,000 N. The lift raises the car 2.5 m. How much work is required to accomplish this task?

A.
27,500 J

B.
4400 J

C.
2.27 x 10-4 J

D.
22,500 J

Answers


Potential energy = (weight) x (height)

After the car has been raised 2.5 meters, it has

                 (11,000) x (2.5) = 27,500 Joules

MORE potential energy than it had before it was lifted.

That's the energy that has to come from the work you do to lift it.

Since no mechanical process is ever 100% efficient, the work required
to accomplish this task is at least  27,500 joules.


The car gains Ep=mass*g*difference_in_height=11000*2.5=27500 J

Answer A
HIGH SCHOOL

Acceleration involves a change in

Answers

Acceleration involves a change in speed and direction.

HIGH SCHOOL

Calculate the magnitude of the horizontal vector that is 100 units long and is oriented at 45 degrees

Answers

Your question is somewhat twisted up.  We would be justified in simply asking you to correct the question.  But I think I know what you're talking about, so I'll try to answer it.

A horizontal vector is one that's oriented at an angle of zero degrees, not 45 degrees.  I think what you want is the horizontal component of the vector that you're describing.

Its horizontal component is  100 cos(45)  = 100 / √2  =  70.71 units.
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