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1. An alien starship is 0.20 lightyears from Earth and traveling at 0.70c, as observed from Earth. This ship sends out a smaller scout ship to see if the inhabitants of Earth are friendly. This scout ship travels at 0.90c as seen from the starship and has a mass of 350,000 kg. a) Determine the velocity of the scout ship as seen from an observer on Earth. b) At the time of the launch of the scout ship, what is the distance to Earth as measured by the aliens abroad the main ship, and c) and the scout ship?. d) Find the time it takes the scout ship to get to Earth as seen by both Earth and main ship observers. e) What is the kinetic energy of scout ship from the reference frame of the Earth?
When a light bulb is connected across the terminals of a battery, the battery delivers 20.6 W of power to the bulb. A voltage of 10.4V exists between the terminals of the battery, which has aninternal resistance of 0.406. What is the emf of the batte..
A spring has a spring stiffness constant, K, of 430 N/m. Find how much must this spring be stretched to store 50 Joule of potential energy
A 2.00 cm high object is placed 3.0 cm in front of a concave mirror. If the image is 6.0 cm high and virtual, what is the focal length of the mirror
define the rock's tangential deceleration. You want to visit your friend in Seattle during spring break. To save money, you decide to travel there by train. Unfortunately, your physics final exam took the full 3 hours.
a 15kg child stroller is moving towards you with a speed of 2.5m/s. how much work is required to stop the stroller
An electron orbits a proton at a radius of 5.42 10-11 m. What is the magnitude of the magnetic field at the proton due to the orbital motion of the electron?
A particle moves along the x axis. It is initially at the position 0.210 m, moving with velocity 0.090 m/s and acceleration -0.340 m/s2. Find its velocity at the end of this time interval
A uniform cylinder (radius = 10.0 cm) is mounted so as to rotate freely about a horizontal axis that is parallel to and 5.0 cm from the axis of the cylinder, what's the angular speed of the cylinder
A person is riding a bike, the wheels of a bike have an angular velocity of +18.5 rad/s. Evaluate the angular acceleration of each wheel
A passenger walks from one side of a ferry to the other as it approaches a dock. What is the magnitude of the ferry's velocity relative to the water
A player for a college football team blocked a field goal attempt by jumping and knocking the ball away in front of the crossbar at a point 11 feet above the field. If Owens was 6 ft. 3 in. tall, and could reach 1 ft., 11in. above his head, what was ..
A Carnot engine has an efficiency of 0.361, and the temperature of its cold reservoir is 406 K. (a) Determine the temperature of its hot reservoir. (b) If 5950 J of heat is rejected to the cold reservoir, what amount of heat is put into the engine..
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