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the compressed spring is release what is the work done in compressing the spring,what is the speed of the ball the moment it leaves the spring,suppose the ball is launched straight up into the air h
A ceiling fan with 90-{rm cm}-diameter blades is turning at 61 rpm. Suppose the fan coasts to a stop 25 s after being turned off. What is the speed of the tip of a blade 10 {rm s} after the fan is
A 500 g chunk of unknown metal , which has been in boiling water for several minutes, is quickly dropped into an insulating Styrofoam beaker containing 1.00 kg of water at room temperature (20°
A sphere of mass 2.8 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes an angle of 40° with the vertical when at rest. What is the magnitude of th
A 0.525 {rm kg} ball starts from rest and rolls down a hill with uniform acceleration. How far did it roll the first 7 seconds of motion?
A balloon with a radius of 14 cm and an electric charge of 3.75 × 10-9 C is brought within the electric field of the larger balloon so their centres are 40.0 cm apart. Determine the magnitude
The radius of a proton is 0.9e-15 m; assume that if the particles touch, the distance between their centers will be twice that. What will be the total kinetic energy of both particles an instant bef
A 1500-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16480 N on the sub, as well as a downward resistive force of 1160 N. What is the submarine'
A driver in a car traveling at a speed of 72 km/h sees a cat 102 m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 98 m?
A 25 kg solid door is 220 cm tall, 91 cm wide. What is the door's moment of inertia for rotation about a vertical axis inside the door, 15 cm from one edge?
The coefficient of kinetic friction between the sled's runners and the hard, icy snow is 0.040, and the girl and sled together weigh 644 N. How far does the sled travel on the level ground before co
Three uniform spheres of mass m1 = 2.00 kg, 4.00 kg, and m2 = 6.00 kg are placed at the corners of a right triangle. Calculate the resultant gravitational force on the 4.00 kg object, assuming the
What direct evidence do astronomers have that supports the heavy element formation in stars?
How much time passes after the speeder passes before the police car overtakes the speeder (assumed moving at constant speed)?
A space station, in the form of a wheel 130 m in diameter, rotates to provide an "artificial gravity" of 3.50 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of r
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 55.0 cm. The explorer finds that the pendulum completes 91.0 full swing cycles in a time of 139 s.
A merchant in Katmandu sells you a solid gold 1 kg statue for a very reasonable price. When you get home, you wonder whether or not you got a bargain, and so you lower the statue into a a container
The local record time for this trick is 11 s. Relative to the escalator, what speed must the student exceed in order to beat the record?
The deepest point in the ocean is in the Mariana Trench, about 11 km deep. The pressure at the ocean floor is huge, about 1.13 x 10^8 N/m2. Calculate the change in volume of 1.00 m^3 of water carri
If the coefficient of kinetic friction between a 33 kg crate and the floor is 0.26, what horizontal force is required to move the crate at a steady speed across the floor?
If the forces on an object balance, then it follows that this object (there could be more than one correct choice)
What friction torque is needed to reduce its angular speed from 77.0rpm to 45.0rpm in a time interval of 26.0s ?
What angle in radians is subtended by an arc 1.30 {rm m} in length on the circumference of a circle of radius 2.20 {rm m}? and What is this angle in degrees? An arc 17.0 {rm cm} in length on the ci
The balloons are launched at a velocity of 13 m/s. The acceleration of gravity is 9.8 m/s2 . At what angle must they be launched to just graze the ceiling?
You are lowering two boxes one on top of the other, down the by pulling surface of the ramp . both boxes move together at aconstant speed of 15.0 cm/s . thr coefficient of kinetic friction between