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1) The middle-C hammer of a piano hits two strings, producing beats of 1.45 Hz. One of the strings is turned to 270.00 Hz. What frequencies (in Hz) could the other string have? (Answer to the nearest 0.1 Hz.)
lower possible frequency _________Hz
Higher possible frequency_________Hz
2) Suppose you have a device that extracts energy from ocean breakers in direct proportion to their intensity. If the device produces 12.0 kW of power on a day when the breakers are 1.20 m high, how much (in kW) will it produce when they are 0.400 m high?
___________kW
3) Energy from the Sun arrives at the top of the Earth's atmosphere with an intensity of 1.30 kW/m2. How long does it take for 2.03 109 J of energy to arrive on an area of 1.00 m2? This is the average monthly electrical energy consumption of a family of four in the United States.
___________hr
A ball is thrown horizontally from the top of a building that is 13.85 m high with a speed of 17.83 m/s. Neglecting air resistance, at what angle with respect to the horizontal will the ball strike the ground
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A boy pushes a box that has a mass of 355 N up an incline. Ifthe boy exerts a force of 67 N along the incline, what is the mechanical advantage of the incline
In a large centrifuge utilized for training pilots and astronauts, a small chamber is fixed at the end of a rigid arm that rotates in a horizontal circle. A trainee riding in the chamber of a centrifuge rotating by a constant angular speed of 2.3 rad..
Each second, 1.25 x 1019 electrons in a narrow beam pass through a small hole in a wall. find the magnitude of the magnetic field in the wall at a radius of 0.750 meter from the center of the beam
starting from resta 10 cm diameter compact disk takes 3.0 s to reach its operating angular velocity of 2200 rpm. assume
A hockey puck is sliding along the ice with nearly constant momentum ‹ 4, 0, 4 › kg · m/s, What is the new momentum of the puck
A resistor with resistance 14M? is connected in series with a capacitor with capacitance 1.0?F and a battery with emf 13.5.0V. what is the time constant
A Porsche 914 accelerates uniformly from 0 to 60 mph in5 s. Assuming a frictionless air track and a glider mass of 550 g, find the mass M2 that one must hang from the glider
A bullet is fired through a board 13.5 cm thick, with a line of motion perpendicular to the face of the board. what is its acceleration as it passes through the board
A car is travelling at a constant speed of 31.1 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration mu..
During liftoff, a hot-air balloon accelerates upward at a rate of 3.4 . The balloonist drops an object over the side of the gondola when the speed is 17, How long does it take to hit the ground
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