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A block with a coefficient of kinetic friction μk =0.4 slides down a 30 degree inclined plane. Estimate what acceleration does it experience?
An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir.
a test charge of -5.0 x 10-7 c is placed between two other charges so that it is 50 mm from a charge of -3.0 x 10-7
An elevator (cabin mass 530 kg) is designed for a maximum load of 3100 kg, and to reach a velocity of 2.6 m/s in 3 s. what is the tension the elevator rope has to withstand
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
A grating has 787 lines per centimetre. Find the angles of the first three principle maxima above the central fringe when this grating is illuminated with 655-nm light.
q1. a 40 g rifle bullet travelling 260 ms buries itself in a 4.0 kg pendulum hanging on a 3.0 m long string which makes
A bolt comes loose from the bottom of an elevator thatis moving upward at a speed of 5.42 m/s. The boltreaches the bottom of the elevator shaft in 2.90 s. Howhigh up (in m) was the elevator when the bolt came loose?
a juggler performs in a room with a ceiling 1.95 m above hand level. what is the maximum upward speed in ms which she
An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmosphericpressure. Determine the number of molecules of gas in the container
Two capacitors give an equivalent capacitance of 9.00 pF when connected in parallel and an equivalent capacitance of 1.95 pF when connected in series. What is the capacitance of each capacitor?
Just after opening a parachute of negligible mass, a parachutist of mass 82.5 kg experiences an instantaneous upward acceleration of 1.15 m/s2. Find the force of the air on the parachute
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.954c. what is your breathing rate
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