PHYSICS HIGH SCHOOL

What is the unit of measurement for power?A. m/s2
B. watts
C. joules
D. newtons

Answers

Answer 1
Answer:
Power is the rate of doing work or using energy.

The unit of power is the watt.

         1 watt  =  1 joule per second
 

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Which phrase best describes wave motion

Answers

Hi!
I don't know your options, but i can describe the wave motion for you:

wave motion is energy transfer through space that proceeds in regular variations (such as vibration),- we say that it's an oscillation because of the regular variations. These variations have specific characteristics, such as frequency or length.

The total amount of electrical energy used by a315-watt television during 30.0 minutes of
operation is
(1) 5.67 × 10^5 J (3) 1.05 × 10^1 J
(2) 9.45 × 10^3 J (4) 1.75 × 10^1 J

Answers

The amount of electrical energy used by the television is given by:

E=Pt

where P is the power of the device and t is the time.


The power of the television is P=315 W, while the total time is

t=30.0 min \cdot 60 =1800 s

If we substitute these numbers into the formula, we find the energy:

E=Pt=(315 W)(1800 s)=5.67 \cdot 10^5 J


so, the correct answer is

(1) 5.67 × 10^5 J
W=Pt
W - energy, P - power, t - time

P=315 \ W \nt= 30 \ min= 30 * 60 \ s = 1800 \ s \n \nW=315 * 1800=567000=5.67 * 10^5 \ [J]

The answer is (1).

What is a possible diameter for a typical neutron star?a. 2 km
b. 20 km
c. 200 km
d. 2,000 km

Answers

The possible diameter for a typical neutron star is 20 kilometer. The answer is letter B. The rest of the choices do not answer the question above.

The sun is its highest in the sky during what season

Answers

*olaf voice*

IN SUMMMMMMERRRRRRR
The sun is at its highest in the sky during Summer

Any projectile always has a constant horizontal acceleration of _______.A. 9.81 m.s^2
B. 0 m/s^2
C. -9.81 m/s^2
D. It is not constant.

Answers

Answer: B. 0 m/s^(2)

Explanation:

When we talk about projectile motion, we have to deal with parabolic motion, which has two components: vertical and horizontal.

In the case of Earth, the acceleration is due gravity, which is constant and directed downwards (vertically) and have a value of 9.8 m/s^(2).

Now, in the case of the horizontal component, the acceleration will always be zero.

This is because we are dealing with parabolic movement, the x-component of the velocity remains the same (hence, there is no acceleration), while the y-component always change because it is affected by the acceleration due gravity that acts verticaly.

If the force of gravity on an object increases, what happens to its weight?

Answers

Answer:

It also increases

Explanation:

The strength of the gravitational force between two objects depends on two factors, mass, and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.
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