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Skateboard with a mass of 3kg is moving at a speed of 5 m/s on a level surface. It encounters a hill and rolls up until it stops. To what vertical height does it rise? Ignore friction.
A quarterback is asked to throw a football to a receiver that is 32.9 m away. What is the minimum speed that the football must have
Assume the mass density of Earth from the center to r= R_cm (radius of the core mantle boundary) is d_cm and from R_cm until the surface r=R_e the density is d_e. Using these densities, determine the gravitational potential energy of the Earth
If the tension in each chain at the lowest point is 408 N, find the child's speed at the lowest point.
A 0.94-µF capacitor is charged by a 45.0-V power supply. Find the maximum current in the resulting oscillations
A lamp (R = 151 ohms ), an electric heater (R = 24 ohms ), and a fan (R = 50 ohms ) are connected in parallel across a 119 V line. What power is expended in the heater
You are asked to design a spring that will give a 1310-kg satellite a speed of 3.50 m/s relative to an orbiting space shuttle, What must the force constant of the spring be
A railroad car of mass 2.5 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
A drug prepared for a patient is tagged with 9943Tc, which has a half-life of 6.05 h. What is the decay constant of this isotope
A spherical pot of hot coffee contains 0.75 L of liquid (essentially water) at an initial temperature of 95?C. The pot has an emissivity of 0.60, Calculate the coffee's rate of heat loss by radiation
If a dielectric material with ? = 3.80 is inserted so that it fills the volume between the plates (with the capacitor still connected to the battery), how much additional charge will flow from the battery onto the positive plate
Assume a ray of light is incident on an air / material boundary at 45 degrees to the normal. What is the critical angle for the material when it is surrounded by air
A 55.6 kg child slides down a water slide with a velocity of 0.9 m/sec at the top. At the bottom of the slide, she is moving horizontally, y=1.5 meters above the water. She splashes into the water d=2 meters to the left of the bottom of the slide.
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