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A spaceship moving past the earth with a speed of 0.8 c blasts the earth with pulsed laser photons every 10 seconds. For the observers on earth who see the flashes, what is the time interval they measure?
A 0.060 kg tennis ball, initially moving at a speed of 12 m/s,is truck by a racket causing it to rebound in the oppositedirection at a speed of 18 m/s. What is the change in momentum of the ball?
relative to the ground what is the gravitational potential energy of a 62.0 kg person who is at the top of the sears
Two forces, FA and FB, act on an object such that the object accelerates in the y-direction. FA is 150 N and is 55.0o from the positive x-axis. What third force (magnitude and direction) is necessary if you wish to keep the object from accelerating
In this experiment, the period of a pendulum was gauged when the pendulum's length varied between 20 cm and 100 cm. At what length is it more likely to obtain larger error for the period? Describe
A 50Ω resistor is placed in series with a 40mH inductor. At what frequency will the current in such a circuit lag the applied voltage by exactly 45 deg.?
As they go around, they experience a centripetal acceleration of 2.20 . What is the diameter of this particular Ferris wheel
A child of mass m = 20 kg goes down a slide at a playground. She starts at a height h = 2.2 m with zero velocity. Assuming zero friction, how fast will she be going at the bottom
A 25 ohm resistor at steady state draws a current of 10 amperes. Its temperature is 310 K; the temperature of the surroundings is 300 K.. what is the total rate of entropy generation?
A 121 Watt driveway light bulb is on 6.5 hours per day. Assuming the power company charges 8.6 cents for each kilowatt-hour of electricity used. Calculate the annual cost to operate the bulb
A force of 12 N is applied to the handle of a screwdriver being used to pry the lid off a paint can. As the force moves through a distance of 0.3 m, the screwdriver does 3.2 J of work on the lid. What is the efficiency of the screwdriver?
A Camera flash circuit (being used for a coil gun) with a capacitance of .180 mF is charged to a voltage of 330 volts. Calculate the energy stored in it. What resistance should be put in series with the capacitance to limit the discharging current to..
A mad doctor believes that baldness can be cured by warming the scalp with sound waves. His patients sit underneath the Bald-o-Matic loudspeakers, how many minutes should each therapy session last
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