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1. Estimate the buoyant force that air exerts on a man. (To do this, you can estimate his volume by knowing his weight and by assuming that his weight density is about equal to that of water. Assume his weight is 940 N.) answer in N
2. On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 17000 N.
(a) What is the weight of the displaced air?
answer in N
(b) What is the volume of the displaced air?
answer in m^3
A jogger runs 100m due east, then changes direction for the second leg of the run. At the end of the run, she is 350m away from the starting point at an angle of 25.0° north of east. What were the direction and length of her second displacement? Util..
If we assume uniform acceleration for both horses between A and C, find out the distance from A enough B.
A small piece of dust of mass m = 1.2 g travels horizontally through an electric air cleaner in which the electric field is 472 N/C, What is the charge of the dust particle
A 2500 kg truck moving at 10 m/s strikes a car waiting at a traffic light, hooking bumpers. What was the mass of the struck car
A 20.00 kg wood ball hangs from the 1.10 long wires. The maximum tension the wire can withstand without breaking is 600 N. A 0.710 kg projectile travelling horizontally hits and embeds itself in the wood ball. What is the largest speed this projectil..
A canoe has a velocity of 0.37m/s southeast relative to the earth. The canoe is on a river that is flowing 0.47m/s, Find the magnitude of the velocity of the canoe relative to the river
Two friends, Al and Jo, have a combined mass of 164kg. At the ice skating rink, they stand close together on skates, at rest and facing each other.
If a force of 300N is exerted upon a 60 kg mass for 3 seconds, how much impulse does the mass experience
The length of a simple pendulum is 0.73m, the pendulum bob has a mass of 307 grams, and it is released at an angle of 12° to the vertical. With what frequency does it vibrate? Assume SHM. What is the pendulum bob's speed while it passes through th..
A sealed 88 m3 tank is filled with 4000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. find The final pressure of the gas
For the situation, the magnetic field changes with time according to the expression B = (2.00t3 - 4.00t2 + 0.800)T, and r2 = 2R = 5.00 cm. (a) Calculate the magnitude and direction of the force exerted on an electron located at point P2 when t = 2.00..
If the barge can only be pushed 18 cm deeper into the water before water overflows to sink it, how many 400 kg horses can it carry.
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