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A 10 kg block is hanging from 2 ropes. One exerts a 50 N force at a 15º angle. The other exerts a 95 N force at a 60º angle. Find the magnitude and direction of the force that will bring the block int
Dan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground
An astronaut in gravity-free space is twirling a mass m on the end of a string of length R in a circle, with constant velocity w. Write down Newton's second law in polar coordinates and find the tension in the string.
Edison was a proponent of DC electricity while Westinghouse favored an alternating current approach. Discuss the technological arguments that were brought forward by Edison and Westinghouse. Bring physical detail to your posts.
In the Soapbox Derby, young participants build non-motorized cars with very low-friction wheels. Cars race by rolling down a hill. What is the maximum possible acceleration of a car moving down this stretch of track
A skateboarder shoots off a ramp with a velocity of 6.6m/s directed at an angle of 58 degrees above the horizontal. The end of the ramp is 1.2m above the ground. Let the x axis be parallel to the ground,+y direction be vertically upward, and take ..
Time standards are now based on atomic clocks. A promising second standard is based on pulsars, what is the associated uncertainty
A mass of 2.10 kg is attached to an oscillating spring, and the period of oscillation is 1.50s. Find the spring constant, and if the total energy is 4.55J find the amplitude of the oscillations.
A small solid ball of mass M and radius R rolls without slipping on the track whose height y as a function of horizontal position x is given by y=ax^2, Find an expression for the period of the resulting motion
A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +59 N·m is applied to the wheel for 15 s, giving the wheel an angular velocity of +530 rev/min. The external torque is then removed,..
You do a physics lab experiment on another planet. A small block is released from rest at the top of a long frictionless ramp that is inclined at an angle of 36.9° above the horizontal, What is the value of g
A cosmic-ray proton in interstellar space has an energy of 17.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit around the Sun, What is the magnetic field in that region of space
Sam, whose mass is 71.0kg , takes off down a 45.0m high, 8.00? slope on his jet-powered skis. What is the coefficient of kinetic friction of his skis on snow
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