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Help please
Please read each question and the options carefully, select the best response or write your short answer.

1. What name is given to this principle?

A conservation of mass

B energy principle

C mass-energy theorem

D conservation of energy

2. Mechanical work done on a falling object causes what energy transformation?

A from kinetic energy to gravitational potential energy from thermal energy to gravitational potential energy

B

C D from gravitational potential energy to kinetic energy from gravitational potential energy to thermal energy

3. Which option gives the correct information for a falling object?

A maximum kinetic energy and maximum gravitational

potential energy is achieved at the same time

when kinetic energy is maximum, gravitational

B

potential energy is minimum minimum kinetic energy and minimum gravitational C

potential energy is achieved at the same time when kinetic energy is minimum, gravitational D

potential energy is minimum

4. Which equation is used by the light gate (photogate) to calculate the speed?

A 5 cm / elapsed time

B 5 m/ elapsed time

C D elapsed time / 5 cm elapsed time / 5 m

5. The main reason we repeat our measurements is

to decrease the reliability

ABCD to increase the precision

to increase the reliability

D to decrease the precision

Sagot :

Answer:

1) D, 2) D, 3) B, 4) B, 5) C

Explanation:

You are asked to select the correct answer

1)  The conservation of energy is one of the most important principles of physics that allows solving countless problems in life.

the correct answer is D

2) when a body falls, the gravitational potential energy is transformed into kinetic energy and both are transformed into thermal energy

the correct answer is D

3) When the gravitational potential energy is maximum, the kinetic energy is minimum and when the kinetic energy is maximum, the gravitational energy is minimum.

Correct answer B

4) speed is defined by

         v = x / t

so the correct answer is B in the SI system

5) when we repeat a measurement several times, the random or statistical errors decrease, therefore the confidence of the measurement increases.

The correct answer is C

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