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A student has to escape from his girlfriend's dormitory through a window that is 15.0 m above the ground. He has a 24-m rope, but it will break when the tension exceeds 360 N, and the student weighs 600 N. The student will be injured if he hits the ground with a speed greater than 8 m/s.
(a) Show that he cannot safely slide down the rope.
(b) Find a strategy using the rope that will permit the student to reach the ground safely.
What average power can be supplied by this circuit
An AM radio station operating at a frequency of 960 kHz radiates270 kW of power from its antenna. How many photons are emitted with the antenna every second?
A coin with a diameter of 1.66 cm is dropped onto a horizontal surface. The coin starts out with an initial angular speed of 7.34 rad/s, How far does the coin roll before coming to rest
Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground as he slows down.
A particle, p, has a mass of 2 kg and is traveling with a speed of vp-i = 3.1 m/s. The particle scatters elastically from another particle N, What is the magnitude of the momentum of the recoiling N
The vehicle is released from rest with a restraining force T of 500 N n the control cable which passes around the drum and is secured at D. The wheels roll without slipping. Calculate the inertia of wheel A about its centre in kg.m^2
An ultralight plane and pilot have a total mass of 150 kg. what is the net force acting on the plane and pilot
A 39.0-µF parallel-plate capacitor is connected to a 15.0-V battery. After the capacitor is fully charged, the battery is disconnected without loss of any of the charge on the plates. What would the voltmeter read if the radius of each plate were tri..
The threshold of dark-adapted (scotopic) vision is 4.0 multiplied by 10-11 W/m2 at a central wavelength of 500 nm. how many photons per second enter the eye
A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. how fast is the student going at the bottom of the slide
Suppose that the sound level of a conversation is initially at an angry 70 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 500 Hz, determine the (c) initial and (d) final sound wave amplitudes.
a long solenoid has 100 turnscm and carries current i. an electron moves within the solenoid in a circle of radius 2.28
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