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A steam power plant receives heat from a furnace at a rate of 280 Gj/h. Heat losses to the surrounding air from the steam as it passes through the pipes and other components are estimated to be abou
An astronaut on a strange planet finds that she can jump a maximum horizontal distance of 15.0 m if her initial speed is 3.00 m/s. What is the free-fall acceleration on the planet?
After flying for 15 min in a wind blowing 42 km/h at an angle of 20o south of east, an airplane pilot is over a town that is 55 km due north of the starting point. What is the speed of the airplane r
An observer on the train, however, sees the drops fall perfectly vertically. Determine the speed of the raindrops relative to the ground.
How long does it take for the bolt to fall to the elevator floor? What is the speed of the bolt just as it hits the elevator floor?
Write a vector expression for the ball's position as a function of time, using the unit vectors ˆi and ˆj. By taking derivatives, obtain expressions for (b) The velocity vector v as a func
How high (in terms of If) would these rocks go if a volcano on Mars ejected them with the same initial velocity? The acceleration due to gravity on Mars is 3.71 m/s2, and you can neglect air resista
The rubber worn from tires mostly enters the atmosphere as particulate pollution. Estimate how much rubber (in kg) is put into the air in the United States every year. To get started a good estimate
With what minimum initial speed must she throw the ball upward to accomplish this feat?
Cliff Height you are climbing in the High Sierra where you suddenly find yourself at the edge of a fog-shrouded cliff. To find the height of this cliff, you drop a rock from the top and 10.0 s later
A golf ball is released from rest from the top of a very tall building. Neglecting air resistance, calculate: The position
An egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point 50.0 m below its starting point 5.00 s after
A box rests on a frozen pond, which serves as a frictionless horizontal surface. If a fisherman applies a horizontal force with magnitude 48.0 N to the box and produces an acceleration of magnitude
In a contest of National Football League behemoths, teams from the Rams and the 49ers engage in a tug of war, pulling in opposite directions on a strong rope.
Tarzan, who weighs 820 N, swings from a cliff at the end of a 20.0 m vine that hangs from a high tree limb and initially makes an angle of 22.0o with the vertical assume that an x axis extends horiz
Estimate the velocity of the groundwater flowing from a point 500 feet from a creek. the point is 50 feet above the surface of the creek and the permeability is 10^-5. Approximately how long it take
Three forces acting on an object are given by F1 = (-2.00i + 2.00j) N, F2 = (5.00i - 3.00j) N, and F3 = (-45.0i) N. The object experiences an acceleration of magnitude 3.75 m/s2. (a) What is the di
The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic friction is 0.20. Find the magnitude and direction of the friction force acting on the
A 0.150 kg particle moves along an x axis according to x(t) = - 13.00 + 2.00t + 4.00t2 - 3.00t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the parti
A 125-kg (including all the contents) rocket bas an engine that produces a constant vertical force (the thrust) of 1720 N. Inside this rocket, a 15.5-N electrical power supply rests on the floor. (
A particle of mass m1 experienced a perfectly elastic collision with a stationary particle of mass m2. What fraction of the kinetic energy does the striking particle lose, if?
Calculate the velocity of the puck (magnitude and direction) after a force of 25.0 N directed to the right has been applied for 0.050 s.
Two small plastic spheres are given positive electrical charges. When they are 15.0 cm apart, the repulsive force between them has magnitude 0.220 N. What is the charge on each sphere?
Calculate the diameter of the central beam at a target 2000 km away from the beam source.
If the coefficient of static friction between the sofa and your carpeting is 0.2, find the amount of force it will take to budge the sofa to start it on its way across the room?