Other Physics Answers

1.A 25 kg weather balloon experiences a buoyant force of 710 N of upwards. Determine how long it takes for the balloon to reach a height of 1.0 km if it is released from the ground. (Hint: draw a FBD for the weather balloon on a separate piece of paper as your rough work)

2.Former Toronto Blue Jays center fielder Kevin Pillar is stealing 2nd base. He begins his slide 5.2 m from the base while running at his top speed of 4.5 m/s. If Kevin comes to a complete stop exactly on 2nd base, determine the force of friction acting on Kevin if his mass is 93 kg.

3.

1. A 17.0 kg curling stone is initially moving at 4.5 m/s [forward] along the ice. The coefficient of kinetic friction for the stone and the ice is 0.014. What is the final velocity when it reaches its target that is 27.5 m away
2. Provide a real-life example to briefly explain Newton's Third Law.
3. A 17.0 kg curling stone is initially moving at 4.5 m/s [forward] along the ice. The coefficient of kinetic friction for the stone and the ice is 0.014. How many arrows will the FBD of the curling stone have? Explain what each arrow represent, and which direction it will point to.
4. Harry is hanging on to a rope on the side of a cliff. His friends on the top of the cliff is holding on to the other end of the rope without pulling him up. For Harry's FBD, how many arrows are there, and what does each arrow represent?
5. Continuing from the previous question about Harry hanging on to a rope. For Harry's friends' FBD, how many arrows are there, and what does each arrow represent?
   

a Motorbike is running initially with a speed of 180 m/s at a constant speed for 12secs, at which time BMW motorbike passes him at a speed of 240 m/s and still accelerating at 3m/s2 until it reaches the speed of 299m/s. The driver of the Ducati Motorbike accelerates uniformly and chases the BMW motorbike until he overtakes it. What is the acceleration needed for Ducati driver to overtake the other motorbike if he reaches a top speed of 399 m/s at the time of overtaking? What is the total distance covered by the Ducati Motorbike from its initial point?​

Calculate the weight of a 68.0 kg person:

a) on the surface of the earth

b) at the top of Everest (8848 m above sea level).

c) has 2 1/2 times the radius of the earth

use the information below to answer the following question.

A traditional, double-seat chairlift can move1200 people in 1.00 hrs (with an average mass of 60.0 kg) up a ski hill. A high-speed quad chair can move 2400 people in 30.0 minutes up the hill. The upper terminal (top of the hill) is 100 m higher than the lower terminal (bottom of the hill).

1.The amount of power the quad-seat chair requires just to overcome gravity is ___x10⁴ W. (Give your answer with the correct number of sig digs and do not include units)

2.An electric motor has a power rating of 1.60 kW and operates at 75% efficiency. The amount of work that it can do in 1.0 hrs is ___x10⁶ J. Give your answer with the correct number of sig digs and do not include units)

1. garage door opener is rated at 373 W. In 14.0 s of operation the opener can do ___x10³ J of work. (Give your answer with the correct number of sig digs and do not include units)

2.An automobile engine exerts a force of 595 N to propel the car at 90.0 km/h on a level road. The power output of the engine at that time is ___x10⁴ W. (Give your answer with the correct number of sig digs and do not include units)

True or False. When non-conservative forces are present, the amount of work done increases with the length of the path.

Use the information below to answer the following 2 questions.

A 0.80-kg coconut is growing 10 m above the ground in its palm tree. The tree is just at the edge of a cliff that is 15 m tall.

1.The maximum speed of the coconut if it fell to the ground beneath the tree is ___m/s. (Give your answer with the correct number of sig digs and do not include units).

2.The maximum speed of the coconut if it fell from the tree to the bottom of the cliff is ___m/s. (Give your answer with the correct number of sig digs and do not include units).