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Question: A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. What is the speed of the current?
A 35 g bullet moving at 475 m/s strikes a 4.20 kg bag of flour that is on ice, at rest. The bullet passes through the bag, leaving at 270 m/s. How fast is the bag moving when the bullet exits.
A camera uses a biconvex lens made of glass with an index of refraction of 1.60 and has a radius of curvature of 12cm for the 1st surface, What is the focal length of this lens when used in air
A parallel-plate capacitor C is charged up to a potential V with a charge of magnitude Q on each plate. What is the potential difference across the plates in terms of V
A beam of electrons is accelerated from rest and then passes through a pair of identical thin slits that are 2 nm apart. Calculate the speed of the electrons
A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. What is the maximum speed of the pendulum
had some difficulty getting the right answer for this question wondering if someone could help me out thanks Some of the X-rays produced in an X-ray machine have a wavelength of 1.8 nm
Unpolarized light passes through five successive Polaroid sheets, What is the intensity of the transmitted beam
An electric heater consumes electrical energy at a rate of P = 200 W when connected to a battery with an emf of 120 V. What is the current in the heater
A large flat plate with uniform charge density ? lies on the xy plane. What is the potential difference between the points (0, 0, a) and (a, a, 2a)
Two stationary positive point charges, charge 1 of magnitude3.35 nC and charge 2 of magnitude 1.75 nC, are separatedby a distance of 39.0 cm. An electron is released from rest atthe point midway between the two charges, and it moves along the line..
A string with a length of 3.0 m has two adjacent resonances at frequencies 112 Hz and 140 Hz. What is the wavelength of the first harmonic
A 800 kg rocket sled can be accelerated at a constant rate from rest to 1300 km/h in 2.4 s. What is the magnitude of the required net force
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