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A crate of mass 56 kg is attached to one end of a string, and the other end of the string runs over a pulley and is held by a person as in the figure below. If the person pulls with a force of 90 N, what is the crate's acceleration? (Assume that upward is the positive direction. Indicate the direction with the sign of your answer.)
_____m/s2
A 1432.0 g mass is on a horizontal surface with μk = 0.44, Calculate the distance the spring was compressed. What is the velocity of the mass as it loses contact with the spring
A 2.90 H coil with a resistance of 6.41×101 ? is in series with a 1.14×103 ? resistor. What is the peak value of the potential difference across the coil
At high noon, the Sun delivers 1.10-kW to each square meter of a blacktop road. If the hot asphalt loses energy only by radiation, what is its equilibrium temperature.
A thin, light wire is wrapped around the rim of a wheel, If the suspended object moves downward a distance of 3.40m in 1.86s, what is the mass of the wheel
The bowling ball has a diameter of 20.6 {rm cm}, and the angle the stick makes with the horizontal is 30.0 {rm ^circ}. You may suppose there is no friction between the stick and the bowling ball, though friction with the floor must be taken into acco..
R-134a is flowing at 1kg/s and throttled from 850 kPa and 40 C to - 40 C. Heat is gained at a rate of 1 kJ/s from the surroundings at 25 C
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (26°C) at the ocean's surface, What is the maximum possible efficiency of the system
A vector is given by Rvec = 1.70 ihat + 2.30 jhat + 2.99 khat. Find the magnitude of Rvec
A golf ball strikes a hard, smooth floor at an angle of 30 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.047 kg, its speed is 45 m/s just before and after striking the floor. What is the magnitude of the impuls..
A 89.0 kg skydiver hanging from a parachute bounces up and down with a period of 1.50 s. What is the new period of oscillation when a second skydiver
Assuming the sun to radiate like an idea thermal source at a tempterature of 6000 K, What fraction of the total solar radiation
A 0.58 kg toy airplane is suspended from the ceiling by a 1.6 m long cord and rotates in a horizontal circle. If the cord makes an angle of 35 degrees with the vertical.
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