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A railroad flatcar having a mass of 18600 kg is coasting along at 21 m/s. As it passes under a bridge 10 men (having an average mass of 82 ) drop straight down onto the car. What is its speed as it emerges with its new passengers from beneath the bridge? (in m/s)
A narrow bar of uniform thickness is 11.8 m long and its mass is 16 kg. The bar is supported horizontally from a ceiling by two vertical ropes. One rope is 2.2 m from one end of the bar. The second rope is 1.6 m from the other end of the bar.
(a) What is the tension in the first rope? (In N)
(b) What is the tension in the second rope? (In N)
The low-frequency speaker of a stereo set has a surface area of 0.015 m^2 and produces 1 W of acoustical power.
a) What is the intensity at the speaker? (In W/m^2 )
b) If the speaker projects this sound power uniformly in all directions, at what distance from the speaker is the intensity equal to 0.084 W/m^2? (In m).
A 34cm diameter wheel accelerates uniformly about its center from 130rpm to 370rpm in 4.8s. Determine the tangential component of the linear acceleration of a point on the edge of the wheel 1.6s
My moter has effciency of 80% with a flywheel attached to its shaft. The flywheel had a diamter of 2 ft and weighs 40 pounds. What is the input power in watts
A 2.4 g marble is fired vertically upward using a spring gun. The spring must be compressed 8.0 cm if the marble is to just reach a target 20 m above the marble's position on the compressed spring.
A balsa wood block of mass 52 g floats Ona Lake, bobbing up and down at a frequency of 2.6 Hz. What is the value of the effective spring constant of the water?
What is the magnitude of the impulse delivered to the astronaut? What is her new direction (relative to the initial direction)?
Two harmonic waves travelling in opposite directions interfere to produce a standing wave described by y'(x,t)=4sin5xcos6t where x is in (m) and t is in (s). What is the approximate frequency of the interfering waves?
A common flashlight bulb is rated at 0.30 Amp and 2.8 Volt (the values of the voltage and current under operating conditions). compute the temperature of the filament when the bulb is on
The Earth's magnetic field is approximately 5 cross product 10?5 T. If the field produced with the current in a long straight wire 1.4 mm from the wire is equal to the Earth's field, what is the current in the wire?
DATA: A = 2, B = 6, C = 5, D = 6, E = 2. Consider the charge at the center of the square. What is the x-component of the net force on this charge?
A rocket is launched from a 350 m high cliff at an angle of 25? with an initial velocity of 50 m/s. The rocket engine produces a constant horizontal acceleration of 5 m/s2. (g=9.8m/s2). Begin by drawing a diagram and determine:
A normal run of the mill spark-ignition engine (Otto cycle) runs with a compression ratio of 10.5:1 while operating with a low temperature of 212°F and has a low pressure of 210 kPa. If the work output is 1100 kJ/kg, calculate the maximum thermal ..
An atom of a particular isotope of cobalt has an atomic mass number of 59. The addition of two electrons would make this atom electrically neutral. What is the number of electrons
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