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Q. A 6.0 kg box is held at rest by two ropes that form a 30 degree angle with the vertical. and external for F acts vertically downward on the box. the force exerted by each of the two ropes is denoted by T. A force diagram shows the fours forces acting on the box at equilibrium. Magnitude of force F is 410 N.
Q. A weight lifter lifts a 320 N set of weights from ground level to a position over his head, a vertical distance of 2.15 m. How much work does the weight lifter do, assuming he moves the weights at constant speed?
A 270 ball and a 520 ball are linked by a 50.0-cm-long massless, rigid rod. The structure rotates about its center of mass at 120 rpm. What is its rotational kinetic energy.
A solid cylinder with mass and radius, rotating with angular speed about an axis throughout its center, is set on the horizontal surface for which the kinetic friction coefficient is.
A horizontal force of 213 N is exerted on a 1.90 kg discus as it rotates uniformly in a horizontal circle (at arm's length) of radius 1.60 m. determine the time for one revolution of the discus. Round the answer to 2 decimal places.
A basketball player makes a jump shot. The 0.600 kg ball is released at a height of 2.00 m above the floor with a speed of 7.20 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.20 m/s Find the work done on the ball by air ..
A certain particle has the life time of 10^-7 s, while measured at rest. How far does it go before decaying if its speed is 0.99 c when it is created.
A loudspeaker is placed between two observers who are 120 m apart, along line connecting them. If one observer records a sound level of 52.8 dB and the other records a sound level of 83.5 dB, how far is the speaker from each observer? Enter the longe..
A 56.0 kg ice skater spins about a vertical axis by her body with her arms horizontally outstretched, making 1.50 turns each second. The distance from one hand to the other is 1.5 m . Biometric measurements indicate that each hand typically makes ..
An electric motor rotating a workshop grinding wheel at a rate of 9.90 x 10^1 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 1.70 rad/s2.
The George Washington bridge, that spans the Hudson River between New York and Jersey, is 4670 feet long and is made out of steel, How much does it expand in length between winter and summer.
A person eats a dessert that contains 230 kcal. The skin temperature of this individual is 36° C and that of her environment is 21° C. The emissivity of her skin is 0.85 and its surface area is 1.3 m2. How much time would it take for her to emit the ..
How many J of energy must be removed when 156 g of steam, at a temperature of 175.0 °C, is cooled and frozen into 156 g of ice at 0 °C.
The driver of a car wishes to pass a truck that is travelling at a constant speed of 20 meters per second. Initially, the car is also travelling at 20 meters per second and its front bumper is 24 meters behind truck's rear bumper.
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