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1. How much energy is required to accelerate a spaceship with a rest mass of 127 metric tons to a speed of 0.422 c?
2. Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 1.05 percent of this energy to accelerate spaceships, then how many missions would be possible in one year?
A 180.0- g copper block at 90.0 oC is dropped into an aluminum calorimeter cup initially at 22.0 oC. What is the final temperature of the system
A near-sighted person's eyeglasses has a focal length of ? 22.0 cm, and the lens is 1.8 cm from the eye. what should be the focal length of the corresponding contact lens
A 4.00-kg mass is connected by a light cord to a 3.0 kg mass on a smooth surface. The pulley rotates about a frictionless axle and has a moment of inertia of 0.50 kg · m2.
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
a 600 ton Boeing business jet is flying at 500 mph at a constant altitude of 35,00 ft. if the jet is holding passengers as cargo amounting to a weight of 37 tons, what is the lifting force acting on the jet provided by the air?
What is the muzzle velocity
A fixed 0.15 kg solid-disk pulley with a radius of 0.060 m is acted on by a net torque of 5.4 m�·N. What is the angular acceleration of the pulley
A 530kg cannon fires a 11kg cannonball with a speed of 200m/srelative to the muzzle, When the cannon fires, what is the speed of the cannonball relative to the earth
Is the collision completely elastic
Male mosquitoes in the mood for mating find female mosquitoes of their own species by listening for the characteristic "buzzing" frequency of the female's wing beats.
Expand Lagrangian to second order about equilibrium coordinates, r_0, phi = wt and find the condition for stability against small oscillations.
If the airplane somehow continues to fly as if nothing had happened, where is engine relative to the airplane at the moment the engine hits ground.
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