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A 20-kg boy runs at 4 m/s and jumps on a rest 5-kg skateboard. (1) Find the skating velocity. (2) Which law do you apply to solve this problem?
A rectangular loop of wire carrying a current is perpendicular to a magnetic field. The field is uniform in the region shown and is zero outside that region. What is the direction of force
A hollow spherical shell with mass 2.25 kilogram rolls without slipping down a slope that makes an angle of 30.0 degree with the horizontal. Obtain the magnitude of frictional force acting on spherical shell
If the maximum acceleration the vehicle’s brakes are capable of is −6 m/s2, illustrate what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer?
In Rutherford’sfamous scattering experiment that led to the planetary model of theatom, alpha particles (having a charge of + 2e and a mass of 6.64 x10-27 kg) were fired toward a gold nucleus with charge of + 79e. Thealpha particle, initially very..
the heart produces a weak magnetic field that can be used to diagnose certain heart problems. it is a dipole field
An airplane with a speed of 77.3 m/s is climbing upward at an angle of 31.3 ° with respect to the horizontal. When the plane's altitude is 845 m, Calculate the distance along the ground
an object of mass m 6.64kg is attached to a rope of negligible mass that is strung between two tops of two vertical
an electron is accelerated by a constant electric field of magnitude 305 nc.a find the acceleration of the electron.b
A firm wants to determine the amount of frictional torque in their current line of grindstones, so they can redesign them to be more energy efficient. What is the angular acceleration of the grindstone
This procedure has actually been used to "weigh" astronauts in space. A 42.5-\rm kg chair is attached to a spring and allowed to oscillate. What is the mass of the person
When a pitcher throws a curve ball, the ball is given a fairly rapid spin. If a 0.15-kg baseball with a radius of 3.7cm is thrown with a linear speed of 48 m/s and an angular speed of 42 rad/s, how much of its kinetic energy is translational and how..
Suppose that the sound level of a conversation is initially at an angry 70 dB and then drops to a soothing 50 dB. determine the final sound wave amplitudes
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