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At a height of ten meters above the surface of a freshwater lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.178 s later. The air and water temperatures are 20 oC. How deep is the lake?
the masses of the earth and moon are 5.98 x 1024 and 7.35 x 1022 kg respectively. identical amounts of charge are
What is the longest wavelength of light that may be absorbed by a hydrogen atom that starts in the second excited state
A 45 kg girl is standing on a 130 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.33 m/s relative to the plank.
A small object with a mass of 380 mg carries a charge of 35.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 5.00 cm. If the thread makes an angle of 12.0° with the vertical, ..
A block starts from rest at the top of a 30o inclined frictionless plane and after travelling 1 meter encounters a spring, of constant 3.0 kN/m, find how much would block compress the spring
two hockey players are traveling at velocities of v1 13 ms and v2 -19 ms when they undergo a head-on collision. after
a proton is released from rest in a uniform electric field of magnitude 412 nc. a find the electric force on the
A 5.5kg block is initially at rest on a frictionless horizontal surface. It is pulled with constant horizontal force of 3.8 newtons. How far does it move in this time
A large crate with mass m rests on a horizontal floor. The coefficients of friction between the crate and the floor are µs and µk. What magnitude of force \vec F is required to keep the crate moving at constant velocity
Determine how many times greater heat loss occurs through a glass window thats 80.0 cm high, 70 cm wide, and 0.300 cm thick (k = 0.791 W/m°C) than a electrical supply line running outside to an exterior mounted light.
A free electron and a free proton are exactly 1.2cm apart. Find the magnitude of the acceleration of the proton
An iron bar of mass, 0.37 kg, slides down a frictionless incline 0.67 m high. What is the speed of the combined masses after collision
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