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A 1000-kg rocket has a net propulsion force of 20 kN (kiloNewtons). Over a short time period, it uniformly speeds up from an initial velocity of 30 m/s to a final velocity of 60 m/s. Assume that the mass of the rocket is constant during this time period and that the net force is along the direction of motion. What is the net work done on the rocket in kilojoules (kJ)?
A Carnot-efficiency engine operating between a reservoir of liquid mercury at its melting point and a colder reservoir extracts 15.0 J of heat from the mercury and does 4.0 J of work during each cycle. What is the temperature of the colder reservo..
A 32.0 kg child takes a ride on a Ferris wheel that rotates four times each minute and has a diameter of 18.0 m. What is the centripetal acceleration of the child
A 2000w air conditioner and 700w refrigerator each operate on 120V rms. find current through air conditioner
Water drives a waterwheel (or turbine) of radius R = 3.0 m as shown in the figure. The water enters at a speed v1 = 6.5m/s, What is the torque the water applies to the waterwheel
Point charges q1 = -4.10 nC and q2 = -4.10 nC are separated by distance 3.00 mm, forming an electric dipole. What is the direction fo the dipole moment
A particle moves along the x axis. It is initially at the position 0.270 m, moving with velocity 0.070 m/s and acceleration -0.410 m/s2. Find its velocity at the end of this time interval
A 2.20 kg object is suspended from a spring with k = 18.00 N/m. The mass is pulled 0.35 m downward from its equilibrium position and allowed to oscillate. What is the highest kinetic energy of object.
A hollow, conducting sphere with an outer radius of 0.252 m and an inner radius of 0.210 m has a uniform surface charge density of +6.57×10?6 C/m^2. find the new charge density on the outside of the sphere
A generator delivers an AC voltage of the form ?v = (64 V) sin (75?t) to a capacitor. The maximum current in the circuit is 1.50 A. Find the rms voltage of the generator
A car of mass 930 kg is traveling over the top of a hill, If the hill has a radius of curvature of 38 m and the car is traveling at 13 m/s, what is the normal force between the hill and the car at the top of the hill
The drag coefficient, D, for a spherical raindrop with a radius of 0.445cm falling at its terminal velocity is 1.74×10?5kg/m. Calculate the raindrop's terminal velocity in \rm m/s
baseball toward home plate at 85 miles per hour with a spin of 1800 revolutions per minute. Explain how many rotations does it make on a path of 60 feet?
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