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When a rifle is fired, the person firing the rifle absorbs the recoil. Consider an Olympic biathlete firing a competition rifle. Compitition rifles have a mass of 3.5 kg and fire a 22 calibur bullet with a mass of 2 g. the bullet leaves the barrel at 365 m/s. the length of time if firing is 5 milliseconds. What is the magnitude of the force absorbed by the athlete?
A person walks first at constant speed of 5.00 m/s along a straight line from point a to point band, What is her average speed over the entire trip
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. calcultae the velocity of the target ball after the collision
Consider a string with length 36 cm. The two ends are attached to the ceiling, separated by distance 30.0 cm. A 1 kg mass is attached to the string at distance 15 cm from the left end. Then the mass hangs suspended in Earth's gravity. (a) Determin..
The temperature of a black body is increased by 10.5 percents. By how many percents did the wavelength of the peak change
A layer of synthetic diamond is grown on a quartz substrate inside a vacuum chamber. What is the thickness t of the thin film of diamond
A small sphere of charge q1 = 0.872 µC hangs from the end of a spring. When another small sphere of charge q2 = -0.642 µC is held beneath the first sphere, the spring stretches by d = 3.57 cm from its original length.
In a photoelectric-effect experiment, the maximum kinetic energy of electrons is 3.2eV . When the wavelength of the light is increased by 50% , What is the work function of the cathode
The distance between two successive minima of a transverse wave is 2.45 m. Five crests of the wave pass a given point along the direction of travel every 14.5 s. (a) Find the frequency of the wave. Hz (b) Find the wave speed. m/s
A puck slides along the frictionless track shown in the figure with an initial speed of 7.40. Suppose the puck turns all corners smoothly, with no loss of speed.
If the angle between wires supporting the street lamp is reduced to 110°, what is the tension in each wire.
What is the minimum time necessary for crossing.
Person a is 20 ft to the right of person b. Person a recieves a ball and throws it 18.9 m away, angle of 25 degree celcius to the right horizontal, what is his average velocity(magnitude and direction) if he takes a straight path
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