Question

1. What is the weight of a 2.88 kg snake? (1 marks)


2. A girl drops a rock straight down from a bridge. Assume negligible air resistance. How fast is it going 4.0 s later?
(2 marks)

3. A rock with a mass of 22.45 kg is falling from a tall tower.
a. What is the Net Force if the rock is in free fall? (1 mark)


b. What is the Net Force if the rock experiences an air resistance of 16.44 N (1 mark)


c. What is the Net Force when the rock reaches its terminal velocity of – 15m/s? (1 mark)


4. A 75.0 kg person stands on a scale in an elevator.

a. . What does the apparent weight (scale read) when the elevator is at rest? (2 marks)


b. . What does the apparent weight (scale read) when the elevator is climbing at a constant speed of + 3.00 m/s? (2 marks)


c. . What does the apparent weight (scale read) when the elevator accelerates upwards at + 1.46 m/s2? (2 marks)



d. . What does the apparent weight (scale read) when the elevator accelerates downwards at - 1.46 m/s2? (2 marks)

Answer 1

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