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A car of mass m accelerates from rest along a level straight track, not at constant acceleration but with constant engine power, P. Assume that air resistance is negligible. (a) Find the car's veloc
Assume that the area of contact between an automobile tire and the road is a rectangle with dimensions 17.5 cm cross 6.5 cm. What tire pressure is needed to support a car of mass 1100 kg? What woul
A 6.0-kg mass at the end of a spring vibrates 3.0 times per second with an amplitude of 0.13m. Determine (a) the velocity when it passes the equilibrium point. (b) the velocity when it is 0.10m from
Both the hare and the tortoise cross the finish line at the exact same instant. Assume both animals, when moving, move steadily at their respective speeds. How far is the tortoise from the finish li
A third charge of +10.4 micro-Coulombs is placed at x = -0.25 m, y = 0 m. At what angle is the total electric filed is directed at the the point x = 0 m, y = +0.17 m if measured counter-clockwise fr
There is a "dead-air" layer next to your skin that acts as insulation. If the dead-air layer is 5.0 thick, what is the person's rate of heat loss by conduction?
Point charges of +2.00nC and -5.00nC are arranged on two of the vertices of an equilateral triangle. Find the magnitude and sign of the third charge which must be placed at the 3rd vertex of the tri
A parallel-plate air-filled capacitor having area 44 cm2 and plate spacing 5.0 mm is charged to a potential difference of 850 V. Find the following values. (a) the capacitance
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 39.5 m/s and initial angle of 30.4° with res
In the Bohr model of the hydrogen atom, an electron in the 5th excited state moves at a speed of 8.76 x 104 m/s in a circular path of radius 1.32 10-9 m. What is the effective current associated with
A plane, diving with constant speed at an angle of 49.0° with the vertical, releases a projectile at an altitude of 510 m. The projectile hits the ground 7.00 s after release. How far did the pr
In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.2 m above the equilibrium position. What will be the vertical position of
A point charge +2Q is at the origin and a point charge -Q is located along the x-axis at x=d. Find a symbolic expression for the net force on a third point charge +Q located along the y-axis at y= d
If the initial velocity of the ball is horizontal, what minimum magnitude must it have if the ball is to clear the net?
If the mass of the point charge is 5.5 kg, how far does the charge travel before it stops due to the electric force alone (ignore weight force)? Answer in meters
It swings to an angle of 28.8 degrees with the vertical before coming to equilibrium (taking into account weight - do not ignore weight). If the mass of the charge is 3 kg, what is the surface charg
An object hangs from a spring balance. The balance registers 31 N in air, 21 N when this object is immersed in water, and 29 N when the object is immersed in another liquid of unknown density. What
Three identical electrically charged balls, each of mass 2 kg are suspended from a common point with strings of the same length. if the electric repulsive force between any pair of charged balls is
A positively charged particle with a charge of 10.2pc is suspended in equilibrium in the electric field between two oppositely charged horizontal parallel plates. The square plates each have a charg
Four electrical components are connected to a 120v household circuit. The light bulb dissipates 100W, the electric heater 1800W, the stereo 350W, and the hair dryer 1200W.
The car reached point A 20.0 seconds after passing point B. The car's speedometer indicated a speed of 40.0 m/s when it reached point A a) What was the car's instantaneous speed at point B?
A 7.5nC charge is located 1.8m from a 4.2nC charge. Find the magnitude of the electrostatic force that one charge exerts on the other. Is the force attractive or repulsive?
A polar bear of mass 510 kg is floating on an iceberg in the ocean. As the ice melts, how small can the iceberg get before the bear gets wet feet? (Your answer should be the volume of the iceberg).
Two locomotives approach each other on parallel tracks. Each has a speed of v=85km/h with respect to the ground. If they are initially d=6.5 km apart, how long will it be before they reach each othe