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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?
Tarzan swings on a 35.0-m-long vine initially inclined at an angle of 32.0° with the vertical. What is his speed at the bottom of the swing if he starts from rest
The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 601 mW/ m2
A 0.58 kg block is attached to a spring with a force constantof 116 n/m is free to move on a frictionless, horizontal surface. At that instant what is the force acting on the block
A skier of mass 64 kg is pulled up a slope by a motor-driven cable. What power (expressed in hp) must a motor have to perform this task
a person fishing from a pier observes thatsevenwave crests pass by in 6.2s and estimates the distance between two
Suppose you wish to fabricate a uniform wire from 1.30 g of copper. The wire is to have a resistance of R = 0.420 ?and all the copper is to be used. What must be the length of this wire
an 6.00 g bullet is fired into a 2.40 kg block initially at rest at the edge of a frictionless table of height 1.00 m.
A student at another university repeats the experiment you did in lab. Her target ball is 0.860 m above the floor when it is in the target holder, What is the kinetic energy (in joules) of the target ball just after it is struck
a ferris wheel with a radius of 14.0 m rotates at a constant rate completing one revolution in 30.0s. what is the
a girl kicks a ball from ground level. the initial velocity of the ball has an x-component of 17 m/s and a y-component of 10 m/s, what is the highest elevation reached by the ball
An incoming 0.14 kilogram baseball has a speed of 45 m/s. The batter hits the ball, giving it a speed of 60 m/s. If the contact time is 0.040 second, find what is the average force of the bat on the ball
shows a particle with positive charge q = 1.60 x 10-19 C is moving with speed v = 8.43 x 104 m/s toward a long straight wire with current i = 371 mA. find the magnitude of the force on the particle due to the current
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