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A 5 kg box rests on a table. Amassless string in attached to the box and is hung over a massless, frictionless pulley. A 2. kg mass is attached to the other end of the spring. Find
a) the force that the table exerts on the box?
b) the force that the box exerts on the table?
In a college homecoming competition, eighteen students lift a sports car. Though holding the car off the ground, each student exerts an upward force of 390 N. What is the mass of the car in kilograms? What is its weight in pounds.
A swimming pool has dimensions 28m 11m and a flat bottom. The pool is filled to a depth of 2.30 m with fresh water.
What is the acceleration of a 747 jumbo jet, mass 31,000 kg, in takeoff when the thrust for each of its four engines is 28,000 N?
a basketball player who is 2 m tall is standing on the floor 10 m from the basket. If he shoots the ball at a 40.0 degree angle with the horizontal, at what initial speed should he throw so that is goes through the hoop without striking the backbo..
Two point charges are located as shown in the figure, with charge q1 = +3.5 C at x = ?3.0 m, y = 0, How much work must be done on the electron to move it to the origin
A 1.78 m long air column is open at both ends. The frequency of a certain harmonic is 828 Hz, and the frequency of the next-higher harmonic is 920 Hz. find out the speed of sound in the air column.
Two boxes, m1 = 1.0 kg with a coefficient of kinetic friction of 0.10, and m2 = 2.0kg with a coefficient of 0.20, are placed on a plane inclined at 0 = 30o.
How long does this pendulum take for one oscillation? Presume that all displacement angles are small.
Find out the type of mirror and how far the object is
An aircraft weighing 812 N is accelerated at 11.8 m/s2 for 5 seconds, at which time the aircraft launches. Assume the acceleration is constant
A certain type of laser emits light that has a frequency of 5.2 x 10^14 Hz. The light, however, occurs as a series of short pulses, each lasting for a time of 2.7 x 10-11 s. How many wavelengths are there in one pulse.
A transverse sinusoidal wave on a string has a period T = 45.0 ms and travels in the negative x direction with a speed of 30.0 m/s, What is the maximum transverse speed of the string
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