Work done by the resultant force is always equal to change in kinetic energy a)True b)False

Answers

Answer 1

Answer: b) False

The statement is not always true. The work done by the resultant force is equal to the change in kinetic energy only in the absence of other non-conservative forces, such as friction or air resistance. In the presence of such forces, the work-energy theorem may not hold, and the work done by the resultant force may not equal the change in kinetic energy.

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The calcium carbonate found in limestone was originally extracted from _______.a. seawater
b. shale
c. magma
d. silt

Answers

The correct answer is a:Seawater

Answer:

the answer b

Explanation:

Every 100,000 years, the Earth's orbit becomes more elongated. This change in orbit has caused past ice ages and is called a _____. condensation cycle Milankovitch trend Milankovitch cycle elliptical cycle

Answers

Answer: Milankovitch cycle

Explanation: Every 100,000 years, the Earth's orbit becomes more elongated. this change in orbit has caused past ice ages and is called a Milankovitch cycle.

According to Milutin Milankovitch, the Milankovitch cycle explains the effect of the change in the earth's climate over thousands of year.

A ball of moist clay falls 15.0 m to the ground. It is in contact with the ground for 20.0 ms before stopping. (a) What is the magnitude of the average acceleration of the ball during the time it is in contact with the ground?

Answers

Answer:

a= -0.86 m/s²

The negative sign shows that ball down the ground or moving down

Explanation:

Vf² - Vo² = 2gS

where

Vf = velocity of clay as it hits the ground

Vo = initial velocity of clay = 0

g = acceleration due to gravity = 9.8 m/sec^2 (constant)

S = distance travelled by clay = 15 m

Substituting appropriate values,

Vf² - 0 = 2(9.8)(15)

Vf = 17.15 m/sec.

Formula to use is,

V - Vf = aT

where

V = velocity of clay when it stops = 0

Vf = 17.15 m/sec (as determined above)

a = acceleration

T = 20 ms

Put the values to find acceleration

a=(V-Vf)/T

a=(0-17.15)/20

a= -0.86 m/s²

The negative sign shows that ball down the ground

PLEASE HELP. Really important

Answers

Explanation:

2) C would need the least effort, because the longer the effort distance, the least the effort applied.

A typical mirror in a person's house would be an example of a/an _______ mirror. A. concave
B. convex
C. angular
D. plane

Answers

A typical mirror in a person's house would be anexample of a/an plane mirror. Lenses and mirrors are different. Lenses is atransparent tool containing two curved surfaces used to refract images – eitherconverge or diverge. Mirrors on the otherhand, show what the real image is without distortion.

Penn Foster Students: PLane

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