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A pole-vaulter is nearly motionless as he clears the bar, set 4.2 meter above the ground. He then falls onto a thick pad. The top of the pad is 80 centimeter above the ground, and it compresses by 50 centimeter as he comes to rest.Find his acceleration as he comes to rest on the pad?
A -10uC charge is 3cm away from a +10uC charge. and is 4cm to the left from a +64uC charge. Find the net force on the +10uC charge
A sample of hydrogen atoms is irradiated with light of wavelength 50 nm, what is the kinetic energy (in electron volts) of these photoelectrons
a uniform electric field exists in the region between two oppositely charged parallel plates 1.62 cm apart. a proton is
Laser light of wavelength 635 nm is incident upon two narrow slits separated by .14 mm. On a screen 4.1 m beyond the slits, how far apart are the interference fringes
A 1.30 kg mass on a spring oscillates horizontally with little friction according to the following equation: x=0.0500cos(2.90t), Find the maximum energy stored in the spring during an oscillation
In the ground state of hydrogen, theuncertainty in the position of the electron is roughly 0.10nm. how fast is the electron moving
In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the Earth using a pendulum 11.0 m long, What was the period of oscillation of the pendulum
problem 1 a box is pulled up by a rope at a constant speed. if its mass 20 kg its speed is 3 ms and the vertical
A plane flies at 234 mi/hr (air speed) in the direction northeast; there is a wind of 51 mi/hr (ground speed) in the direction southeast. How far will the plane fly in 94 minutes
The current in a coil drops from 4.1 A to 2.4 A in 0.49 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil
An alpha particle (helium nucleus, charge 2e) starts from rest and travels a distance of 1.88 cm under the influence of a uniform electric field of magnitude 12.2 kV/m
A boy of mass 49.4 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. Find the final velocity of the skateboard
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