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1. A ball is thrown from the top of a roof at an angle of 20o with respect to the vertical. 1 s later a ball is dropped from the top of the roof.
a) If the height of the roof is 20 m, determine the velocity with which the first ball must be thrown in order for both balls to land at exactly the same time.
b) Imagine the velocity of the first ball is now known, and instead it is the height of the building which is unknown. Can you obtain an equation for the height of the building which would result in both balls landing on the floor at the same time.
2. You are firing a cannonball from the top of a cliff at a pirate ship which is behind a mountain. The height of the cannon is 100 m, the height of the mountain is 120 m, and the height of the pirate ship is 70 m.
The mountain is horizontally 200 m away from cannon, while the pirate ship is horizontally 270 m away from the cannon.
The speed of the cannonball after it is fired is 65 ms-1. You could hit anywhere from the bottom of the pirate ship to the top in order to sink it. Over what angles could you fire the cannonball to sink the pirate ship?
When she stands 3.5m from you, what is the height of her image formed on the retina of your eye, What is the height of her image when she is 4.5 m from you
In a physics lab, a cube slides down a frictionless incline as shown in the figure and elastically strikes another cube at the bottom that is only 1/5 its mass. If the incline is 35 cm high and the table is 95 cm off the floor, where does each cube l..
A car starts from rest and reaches a speed of 7.6 m/s in 5.1s. How far will it have traveled in that time
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A ladder is leaning against a vertical wall. The coefficient of friction between the ladder and the horizontal surface is μ1 = 0.295, Find the maximum angle with the vertical ladder can make without falling on the ground
The maximum strength of the earth's magnetic field is about 6.9 x 10-5 T near the south magnetic pole. What is the minimum number of turns (area per turn = 0.021 m2) that the coil must have to produce an rms voltage of 170 V
A 4.0 kg mess kit sliding on a frictionless surface explodes into two 2.0 kg parts, one moving at 1.0 m/s, What was the original speed of the mess kit
What is the friction force that acts on the bear?
Neutron stars consist only of neutrons and have unbelievably high densities. Calculate the density of such a star
A 100 liter water tank is filled to the brim with water when the temperature is 5.00°C. Water has a coefficient of volume expansion of 207 × 10-6/°C. what is the volume of water that overflows the tank
question a radio wave sent from the surface of the earth reflects from the surface of the moon and returns to the
A day on a distant planet observed orbiting a nearby star is 31.7 hours. Also, a year on the planet lasts 79.5 Earth days.* Calculate the average angular speed of the planet
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