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During a lightning flash, there exists a potential difference of V(Cloud)-V(Ground)=1.2 x10^9V between a cloud and the ground. As a result, a charge of -25 C is transferred from the ground to the cloud. (a) How much work W(ground-cloud) is done on the charge by the electric force? (b) If the work done by the electric force were used to accelerate a 1100-kg car from rest, what would be it's final speed?
Here's a basketball problem: A 80.0 kg basketball player is running in the positive direction at 7.0 m/s. what is the resulting velocity of the 80.0 kg player
A ball is thrown toward a cliff of height h with a speed of 29m/s and an angle of 60? ^\circ above horizontal. It lands on the edge of the cliff 3.5s later. How high is the cliff
In a period of 1 s, 4.00 x10^23 nitrogen molecules strike a wall with an area of 6.30 cm2. If the molecules move with a speed of 300 m/s and strike wall head-on in elastic impacts, what is the pressure exerted on the wall? (The mass of one N2 mole..
Four horses are tethered at 4 corners of a square field of side 70 metres so that they just cannot reach one another. What is the area left ungrazed by the horses
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
A 100N box initially at rest is pulled by a horizontal rope on a horizontal table the coefficients of kinetic, What is the friction force on the box if the pull is 35N and 75N
Displacement d1 is in the yz plane 58.4° from the positive direction of the y axis, has a positive z component of 5.99 m, find the angle between d1 and d2
A man stands at one end of a 20.0 kg uniform board. What is the mass of the man if the center of the mass of the man-board system is 1.25 m from the man
Two pellets, each with charge 5 microcoulomb (1 microcoulomb = 0.000001 coulombs), are located 0.5 m apart. What is electrical force between the charges.
Just after opening a parachute of negligible mass, a parachutist of mass 82.5 kg experiences an instantaneous upward acceleration of 1.15 m/s2. Find the force of the air on the parachute
Two cars approaching each other collide and stick together after the collision. What was the initial velocity of the second car
A clothes dryer is spinning at 75 rpm. A student opens its door and it comes to rest after rotating through four revolutions. What was the magnitude of the dryer's angular acceleration
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