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1. Marty McFly needs to get "Back to the Future" with hisDeLorean. To do that he needs to reach 39.11 m/s (88 miles perhour) at the same time that lightning strikes the clock tower. He has a maximum acceleration of 4.444 m/s2.
a. What length of road does he need to reach 39.11 m/s?
b. How long before the lightning strikes the clock tower shouldMarty start to accelerate?
c. Marty starts to break immediately after reaching 39.11 m/s.He has a maximum braking acceleration of 10 m/s2, and75 m of road before he crashes into a store front. Can he stop in time?
2. Legolas is standing on the walls of Helm's Deep, which have a height of 6.1 m. There is an orc standing 100.0 m away on the ground. An arrow fired from Legolas' bow has an initial speed of90.0 m/s in the xdirection.
a. How long will it take Legolas' arrow to reach the orc?
b. What is the maximum height the arrow needs to reach?
c. At what angle must he aim to hit the orc?
A Cu wire of 60m length is in a maganetic field of1.20T. If it has a mass of 25g, what is the minimum current through the wire
A one pound weight is released 3 feet off the ground. At the same time a two pound weight is released 5 feet off the ground. When will the two weights have the same altitude? Assume no air friction.
At what speed does the momentum of a particle differ by 8.00% from the value obtained with the non relativistic expression mv
A person throws a ball from height of 0.950 meter with a vertical velocity of +6.00 m/s and misses it on the way down. Find what is its velocity when it hits the ground
A flywheel of mass 187 kg has an effective radius of 0.63 m (assume the mass is concentrated along a circumference located at the effective radius of the flywheel). What is the applied torque on the flywheel
A lump of putty with a mass of 0.210 kg and a speed of 0.830 c collides head-on, What is the mass of the system after the collision
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 521 N. As the drawing shows, Find the tensions in the rope to the left and to the right of the mountain climber
assume a bar 2.5 m long expands 0.5 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated.
An incident X-ray photon of wavelength 0.2800 nm is scattered from an electron that is initially at rest. find the momentum gained by the electron
A cylindrical chamber containing an ideal diatomic gas is sealed by a movable piston with cross-sectional area A = 0.0015 m2. What is the final volume after the mass comes to rest
question a wire 2.80m in length carries a current of 5.00 a in a region where a uniform magnetic field has a magnitude
A cube of unknown material which is 1 m on a side is observed to float in fresh water with 30% of the cube exposed above the water line. how much of the cube (in percent) is above the water line
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