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If astronauts could travel at v = 0.970c, we on Earth would say it takes (4.20 / 0.970)= 4.33 years to reach Alpha Centauri, 4.20 light years away. The astronauts disagree.
a) How much time passes on the astronauts' clocks?
b) What is the distance to Alpha Centauri as measured by the astronauts?
A radio tower is broadcasting an isotropic radio wave with a power of 1000 watts. What is the radiation pressure on a reflecting surface 250 meters away from the tower?
A converging lens with a focal length of 11.4cmforms a virtual image 7.55mm tall, 16.6cm to the right of the lens. Determine the position of the object
Derive a formula for the linear velocity of a planet v(r), where r is the distance from Sun (assume circular orbits). Apply your formula to Earth (r ' 150 *10^6 km). Compare v with the number which follows from the observed period of 1 year.
A 2.6kg block slides along a frictionless surface at 2.0m/s . A second block, sliding at a faster 5.0m/s, collides with the first from behind and sticks to it. What was the mass of the second block
Consider a balloon containing nitrogen molecules at room temperature (20°C) and atmospheric pressure. what is the number of molecules in the balloon
A movig particle encounters an external electric field that decreases its kinetic energy from 9740 eV to 5690 eV as the particle moves from position A to position B. Determine the charge of the particle
a rocket initially at rest on the ground accelerates straight upward from rest with constant acceleration 53.9. the
Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.
What percentage of error in would be made if the moment of inertia of the pulley were avoid? Ignore friction in the pulley bearings.
Two parallel wires 10 cm apart carry currents of 18 A. What is the magnetic force between two wires for both cases
A highway curve of radius 500 m is designed for traffic moving at a speed of 73 km/hr. What is the correct banking angle of the road.
a swimmer capable of swimming at a speed of 1.59 ms in still water i.e. the swimmer can swim with a speed of 1.59 ms
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