GAMSAT Physics Questions & Topics
Re: GAMSAT Physics Free Questions – Weight & Units
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Unit 1 – GAMSAT Physics Questions 1-4
A cube made of steel has a mass of 50 kg on earth. The acceleration due to gravity on earth is 9.81 m/s2, while on the moon it is equal to 1.635 m/s2. (Hint: 1N = 100,000 dynes)
Answer the following:
1. What is the cube’s mass on the moon?
A. 50/6 kg
B. 300 kg
C. 50 kg
D. 44 kg
2. What is the cube’s weight on earth?
A. 490.5 dynes
B. 490.5 kg
C. 81.75 kg
D. 4.905 x 107 dynes
3. Which weighs more, 50 kg of cotton on earth or 50 kg of steel on the moon?
C. they have the same weights
D. can’t be determined
4. Which has higher density, 50 kg of cotton on earth or 50 kg of steel on moon, considering that they have the same volume?
C. they have the same densities
D. can’t be determined
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GAMSAT Physics Answers
Answer to Question 1:
The mass of the cube will remain the same even if it is on the moon. The key is therefore C.
Answer to Question 2:
Weight of an object is defined as its mass times the acceleration of gravity (g). Since the weight that we are asked for is on earth, we will use 9.81 m/s2. Multiplying this with the cube’s mass, we get:
They key is therefore D.
Answer to Question 3:
Both cotton and steel have the same masses, irrespective of their location. However, since the cotton is on earth, which has an acceleration due to gravity 6 times that of the moon, it follows that it would weigh more than the steel on the moon. The key is therefore A.
Answer to Question 4:
Density is defined as the mass of an object per its unit volume, or
Since both cotton and steel have the same masses and volumes, then they also have equal densities.
The key is therefore C.
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