The work done in lifting an apple one meternear Earth’s surface is approximately
(1) 1 J (3) 100 J
(2) 0.01 J (4) 1000 J
Answers
Answer: Option 1: 1 J
Explanation:
Average mass of an apple is between 60 g to 200 g It is not greater than this.
We can take an average mass, m =130 g
This average mass approximation would not affect the final answer.
The work done in lifting any object is given by:
W = m g h
Where, m is the mass of the object, g is the acceleration due to gravity and h is the height to which the object is lifted.
It is given that, h = 1 m
g = 9.8 m/s²
m = 130 g = 0.13 kg
⇒W =0.13 kg×9.8 m/s²×1 m = 1.3 J ≈ 1 J
Thus, the work done in lifting an apple one meter near Earth’s surface is approximately 1 J
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Pulling a rope in tug-of-war
Answers
Explanation:
1. Location.
Hurricanes are defined as severe tropical storms that form over warm ocean waters starting as storms in the Caribbean(North American continent) or off the west coast of Africa. As the storms drift slowly westward, they gather heat and energy through contact with warm ocean waters. Evaporation from the seawater increases their power.
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2.
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300 J
400 J
1000 J
Answers
Answer:
The K.E of the pendulum is, K.E = 200 J
Explanation:
Given data,
The kinetic energy of the bob of the pendulum at the bottom, K.E = 600 J
The potential energy at the height 4 m, P.E = 400 J
According to the conservation of energy, the total energy of the mechanical system should be conserved.
At the bottom of the swing, the entire mechanical energy of the pendulum is purely kinetic. Therefore the total energy
E = P.E + K.E
= 0 + 600 J
= 600 J
Therefore, the total energy of the system, E = 600 J
At height 4 m, the total energy of the system remains the same.
Therefore,
600 J = 400 J + K.E
K. E = 600 J - 400 J
= 200 J
Hence, the K.E of the pendulum is, K.E = 200 J
Answers
The ability of an apple to change color when exposed to air represents an example of a chemical change.
What is a Chemical change?
A chemical change may be defined as a type of change of materials into another form or new materials with different properties, and one or more than one new substance is formed spontaneously.
The change of color of the apple into brown when it is exposed to air is a chemical change. When you observed the color of an apple is to be brown, you are producing a chemical change. This involves the rearrangement of atoms in one or more substances resulting in a change in their chemical properties or composition.
Therefore, the ability of an apple to change color when exposed to air represents an example of a chemical change.
To learn more about Chemical change, refer to the link:
#SPJ2
Answers
'Pound' can be either a unit of mass or of force. Most people
use it most of the time to mean weight.
Answer:
the answer is pounds
Explanation: