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A force of 4.7 N acts on a 14 kg body initially at rest.
a) Compute the work done by the force in thefirst second.b) Compute the work done by the force in the second second.c) Compute the work done by the force in the third second.d) Compute the instantaneous power due to the force at the end ofthe third second
A car is going with a constant speed of 15 m/s (about 34 mph) in a school-crossing corner, where the speed limit is 10 m/s (about 22 mph). What is the speed of the police car at that point
With what speed in miles/hr (1 m/s = 2.23 mi/hr) must an object be thrown to reach a height of 91.5 m (equivalent to one football field)? Assume negligible air resistance.
The equations for free fall at the surface of Mars and Jupiter (s in meters, t in seconds) are Mars, s = 1.86t^2; Jupiter, s = 11.44t^2. How long would it take an object falling from rest to reach a velocity of 100 km/hr on each planet?
A solid sphere rolling without slipping on a rough horizontal surface with a linear speed 21m/s collides elastically with a fixed, smooth vertical wall. Find the speed of the solid sphere after it has started pure rolling in the backward direction. T..
A square plate of copper with 54.0 cm sides has no net charge and is placed in a region of uniform electric field of 84.0 kN/C directed perpendicularly to the plate. Find the charge density of each face of the plate
In Oersted's experiment, suppose that the compass was 0.27 m from the current-carrying wire. If a magnetic field of 1/4 the Earth's magnetic field of 5*10-5 T was required to give a noticeable deflection of the compass needle, what current must the w..
calculate the capacitance of a planet assuming it is a spherical capacitor of radius r 9550.0 km with charge
A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. determine the amplitude of the simple harmonic motion
A wooden block with m1 = 3.1kg is sliding across a frictionless surface in the ?x direction at 5.2 m/s. What is the velocity of the m2 block in the lab frame after the collision
To determine the muzzle velocity of a bullet fired from a rifle, you shoot the 3.57-g bullet into a 2.47-kg wooden block. The block is suspended by wires from the ceiling and is initially at rest. After the bullet is embedded in the block, the block ..
Consider a 0.11 cm focal length microscope objective that is 0.29 cm from the object being viewed. What magnification is being produced by the objective
A fighter jet is launched from an aircraft carrier with the aid ofits own engines and a steam-powered catapult. The thrust of itsengines is 2.10*105 N. In being launched from rest itmoves through a distance of 87 m and has a kinetic energy of4.50*1..
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