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What is the magnitude and direction of the electric force caused by the floor on the negative charge?
At the end of the music, the CD is rotating at 200 rpm. Find the magnitude of the average angular acceleration of the CD.
A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.40 min trip, find the foll
The hemisphere is placed on its flat surface, with the center directly over a 2.5 mm long line drawn on a sheet of paper. What length of line is seen by someone looking vertically down on the hemisp
What is the wavelength of the waves emitted by the source? What is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling straight toward the
A 48.8 kg pole vaulter running at 11.0 m/s vaults over the bar. Assuming that the vaulter's horizontal component of velocity over the bar is 1.2 m/s and disregarding air resistance, how high was th
Find the coefficient of kinetic friction between the sled and the ground, assuming that it is constant throughout the trip.
If the bullet-block system compresses the spring by a maximum of 86.0 cm, what was the speed of the bullet at impact with the block?
An airplane is flying horizontally with the speed of 1300km/h when an engine falls off. Neglecting air resistance, assume it takes 25 s for the engine to hit the ground. what is the horizontal dista
In the interstellar space in our galaxy, there is a background magnetic field whose strength is on the order of 1 nT. Interstellar space also contains about 1 hydrogen atom per cubic centimeter
Vector B has three times the magnitude and points in the positive x direction. Find the direction and magnitude of the following vectors. A-B (magnitude and direction counterclockwise from the +x ax
Suppose some mysterious force causes Earth to experience an average angular acceleration of 6.05 × 10-13 rad/s2, so that after 12.0 days its angular orbital speed is the same as that of Mercur
A toy rocket moving vertically upward passes by a 1.9 -high window whose sill is 7.0 above the ground. The rocket takes 0.17 to travel the 1.9 height of the window. A. What was the launch speed of t
What is your body temperature in degree Celsius, if you had a fever of 102.5 degrees in Fahrenheit, what would it be in Kelvin and Celsius degrees also? What formula should I use to answer this pro
The second polarizer makes an angle θ=41° with the axis of the first polarizer. What is the angle (in degrees) the initial direction of polarization makes with the first polarizer?
The brace applies a force P to the right end of the beam that is directed upward at the angle with respect to the horizontal. The hinge applies a force to the left end of the beam that has a horizon
The pulley system is used to lift a 52 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assuming the masses of the c
Ignore air resistance. At what angle (positive angle below horizontal) is the cannonball traveling when it hits the water?
What is the magnitude of the objects acceleration after it is released (relative to the ground).
The sand is initially at rest, then moves at a speed of 0.20 m/s along the conveyor belt. What is the instantaneous power generated by this machine?
A popular model for the mass distribution in a spheroid (such as a bulge) is the Hernquist model, with density
A harmonic oscillator consists of a mass of 1g on a spring. Its frequency is 1Hz and the mass passes through an equilibrium position with a velocity of 10 cm/s. What is the order of magnitude of th
How long does it take for the amplitude to drop to half its initial value? (b) How long does it take for the mechanical energy to drop to half its initial value?
A parachutist descending at a speed of -10.0 m/s loses a shoe at an altitude of 50.0 m. (a) When does the shoe reach the ground?
(A) Determine the current through and the voltage across each resistor (B) Find the power dissipated in each resistor, and the power supplied by the battery.