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A 20 kg block is stacked on top of the 20 kg block. Both blocks are glued together. What is the magnitude F of the force, acting horizontally on the two blocks, that is required to make the two bloc
They then both turn around the spindle with their centers superposed. What is the angular frequency in rev/s of the combination?
A net torque of magnitude 500 Nm is exerted on the rotor of an electric generator for 29 s. What is the magnitude of the angular momentum of the rotor at the end of 29 s if it was initially at rest?
Certain car battery with a 12.0 V emf has an initial charge of 132 A·h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how lo
A swimming pool has dimensions 24.0m x 13.0 m and a flat bottom. When the pool is filled to a depth of 1.50m with fresh water, what is the force caused by the water on the bottom?
what is the value of g and its uncertainty inferred from this data. I got the value of g as 2.11 m/s but i am having trouble figuring out the uncertainty.
The road is banked at an angle , and there is no friction between the road and the car's tires. Use = 9.80 throughout this problem. What is the radius of the turn if = 20.0.
Find the coefficient of kinetic friction between a 3.15 kg block and the horizontal surface on which it rests if a 82.0 N/m spring must be stretched by 5.90 cm to pull it with constant speed. Assum
A girl on a sled coasts down a hill. Her speed is 7.8 m/s when she reaches level ground at the bottom. The coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.047
The escape speed from a very small asteroid is only 26 m/s. If you throw a rock away from the asteroid at a speed of 38 m/s, what will be its final speed?
A 81 kg parachutist descends through a vertical height of 310 m with constant speed. Find the increase in entropy produced by the parachutist, assuming the air temperature is 21°C.
Two speakers, 4.00 m apart, are driven by the same audio oscillator so that each one produces a sound with a frequency of 1360 Hz. The speed of sound in the room is 340 m/s. Find all the angles rela
Two conducting wires a and b of circular cross-section have the same length and radii but are made from different metals. The resistivity of wire a is twice that of wire b.
A man pushes a lawn mower on a level lawn with a force of 230 N. If 40% of this force is directed downward, How much force is directed horizontally?
A coil is wrapped with 665 turns of wire on the perimeter of a circular frame (radius = 31 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpen
Some time later the proton is at a point where the potential is 500 V. If no force other than the electrostatic force acts on the proton, what is its final velocity?
Radioactive isotopes often occur together in mixtures. Suppose a 300g sample contains , with a half-life of 12 days, and , with a half-life of 4.5 days.If there are initially twice as many calcium
The Hβ line of hydrogen corresponds to a wavelength of 486.133 nm when measured in a lab on Earth. In observations of the star Megrez in Ursa Major, the absorption line for Hβ is observed
If the electric field at the surface of the sphere is 750 {rm{ kN/C}} and points outward, what is the charge of the point charge? What is the field just inside the shell?
After driving past the factory, the driver hears frequency ff. What is the change in frequency ff - fi heard by the driver?
The intensity of a cylindrical laser beam is 0.800 {rm W}/{rm m}^{2}. The cross-sectional area of the beam is 3.0 times 10^{ - 4} {rm m}^{2}. What is the average power output of the laser?
A staging that weighs 380 N supports two painters, one 140 N and the other 500 N. The reading in the left scale is Fl = 610 N .What is the reading Fr in the right hand scale?
Calculate the elastic potential energy of the spring (take it to be zero for the unstretched spring), the kinetic energy of the cat, the gravitational potential energy of the system relative to the
A 75 kg human sprinter can accelerate from rest to 12 m/s in 3.3 s. During the same interval, a 33 kg greyhound can accelerate from rest to 20 m/s. Compute (a) the change in kinetic energy and (b)
Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs 41.0 N. Determine the force that the table exerts on the box if the weight hanging o