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An astronaut at rest on Earth has a heartbeat rate of 70 beats/minute. Find what will this rate be when she is traveling in a spaceship at 0.90c as measured
(a) by an observer also in the ship and
(b) by an observer at rest on the Earth?
An object is located 75.0 cm in front of a mirror and on the principle axis. The mirror is concave with a radius of curvature 50.0 cm. State the properties of the image
A 30 g steel ball bounces elastically on a steel plate, always returning to the same maximum height h = 14.2 m. With what speed does the ball leave the plate
two charged particles a and b are located near one another. both the magnitude and direction of the force that particle
Two capacitors are connected parallel to each other and connected to the battery with voltage 25V. By how much energy of the system decreases
The triangular coil of wire in the drawing is free to rotate about an axis that is attached along side AC. What is the magnetic moment of the loop
speed of 39.0 m/s through a school zone, exceeding the posted speed limit. Find the distance required for the policeman to overtake the motorist
You have a total charge Q=16fC. An amount q is to be put in one sphere, What value of q maximizes the electrostatic force between the two spheres
A 0.70-kg disk with a rotational inertia given by MR2/2 is free torotate on a fixed horizontal axis suspended from the ceiling. A string is wrapped around thedisk and a 2.0-kg mass hangs from the free end.
A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. What angle would the single rope make relative to the dashed line
An n-type semiconductor has a donor concentration of 1*10^13 cm^-3. If the equilibrium electron concentration is 1.2*10^13 cm^-3
The index of refraction for a diamond for red light of wavelength 654 nm is 2.35, Find the angle of refraction for red light
AM radio signals have frequencies between 550 kHz and 1600 kHz (kilohertz) and travel with a speed of 3.0×108m/s. What are the wavelengths of these signals
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