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A 1625 kg car, having run out of gas, is at rest on a level surface. Assuming an opposing frictional force of -765 kg m/s^2, if a person attempty to push the car due west by exterting a force of 765 kg m/2^2.
- If the person applies a force of 765 kg m/s^2 for 8 seconds, how much work did he do on the car?
- If he exerts a force of 2715 kg m/s^2 to get the car moving, what will be the acceleration of the car?
Identical objects are located at the same distance from two spherical mirrors, A and B. Find the ratio fA/fB of the focal lengths of the mirrors
What is the speed of the bowl? The speed of sound is 340 meters per second.
A electric model train travels at 34.7 cm/s around a circular track of radius 1.61 m. Find the train's period of revolution
If an automobile rounds this curve at 30 {rm m/s}, illustrate what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
A magnifying glass has a converging lens of focal length of 18.80cm. At what distance from a nickel must you hold this lens to get an image with a magnification of +2.47.
A bicyclist is finishing his repair of a flat tire when a friend rides by at 3.8 m/s. How far has he traveled in this time
White light containing wavelengths from 405 nm to 760 nm falls on a grating with 8000 lines/cm. How wide is the first-order spectrum on a screen 2.20m away.
a 0.40kg basketball is thrown horizontally against a board with a velocity of 20m/sec. If the ball rebounds with a speed of 15m/sec. What is the impulse of the ball
The isotope, tritium, has a half-life of 12.3 years. Assume we have 12 kg of the substance. How much tritium will be left after 26years? State your answer in kg ( two decimal places)
Compare the electric force holding the electron in orbit (r=0.53×10?10m) around the proton nucleus of the hydrogen atom, What is the ratio of these two forces
Considering only the gravitational forces that the spheres exert on each other, illustrate what is the magnitude of the initial acceleration of the third sphere?
A microscope has a 16.8 cm tube length, a 0.64 cm focal length of the objective lens, calculate the microscope's magnification
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