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An automobile has a mass of 1500 kg and us moving at a speed of 100 km/h.
a. What is its momentum?
b. What average force will stop it in 5.0 sec?
c. What average force will stop it in 100 sec?
A capacitor has a capacitance of 55pF. In the charging process electrons are removed from one plate and placed on the other plate. how many electrons have been transferred
a rocket of mass m is fired vertically upward from rest. the rockets engine produces a thrust of constant magnitude
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the spontaneous emission wavelength
A gamma ray photon produces an electron-positron pair each with a kinetic energy of 210 KeV. What was the energy and wavelength of the photon
An electric motor rotating a workshop grinding wheel at a rate of 1.16 x 102 rpm is switched off. Find through how many radians has the wheel turned during the interval found in (a)
A 10-kg bowling ball moving at 4.0 m/s bounces off a spring atabout the same speed that it had before bouncing. What is the change in momentum of the bowling ball
One electron collides elastically with a second electron initially at rest. After the collision, the radii of their trajectories are 1.00 centimeter and 2.40 centimeter. Find the energy of the incident electron
Find the typical speed for a tsunami. (Note down that in the open ocean, tsunamis generally have amplitude of less than a meter, allowing them to pass ships unnoticed. As they approach shore, however, water depth decreases and the waves slow down. Th..
Two carts with masses of 4.80 kg and 2.78 kg move toward each other on a frictionless track with speeds of 4.94m/s and 3.17m/s respectively. The carts stick together after colliding head-on. Find out the final speed.
Explain how to calculate the angular velocity of second, minute and hour hands of the clock using the formula delta theta/delta t
A radiation detector is in the form of a circular disc of diameter 3.0cm. It is held 25cm from a source of radiation, whereit records 1250 counts per second. Assuming that the detector records every radiation incident upon it, find the activity of th..
Stars, to a good approximation, are spherical, and emit electromagnetic radiation from a surface of emissivity e = 1. What is the diameter (in millions of km) of this star
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