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Football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 1100 N and the angle between the two r
An object, at the top of a very tall building, is released from rest and falls freely due to gravity. Neglect air resistance and calculate the distance covered by the object between times t1 = 5.54
The density of ice is 917 kg/m3 and the density of sea water is 1025 kg/m3. A swimming polar bear climbs onto a piece of floating ice that has a volume of 5.2 m3. What is the weight of the heaviest
A transformer with 50 turns in the primary and 25,000 turns in the secondary is attached to a 230 V (rms) a.c source. What peak voltage may be obtained from the secondary coil? What rms voltage?
What minimum horsepower must a motor have to be able to drag a 330 kg box along a level floor at a speed of 1.25 m/s if the coefficient of friction is 0.50?
The anode of an x-ray tube may reach temperatures near the melting point of tungsten, 3380 degrees C. How much more rapidly would it radiate heat there than at room temperature (22 degrees C)?
A box weighing 610 N is pushed along a horizontal floor at constant velocity by a force of 210 N parallel to the floor. What is the coefficient of kinetic friction between the box and the floor?
The resistance of an x-ray tube filament is 2 ohms, and about 5 A of d.c. current is required to achieve 2200 degrees C. What voltage must the filament power supply put out
A strong lightning bolt transfers about 25 c to earth if each water molecule donates one electron to the lightning, what mass of water lost an electron to the lightning? one mole of water has
Suppose that the tower height is h = 10.80 m, and that the bulls-eye's horizontal distance is d = 3.8 m from the launch point. If the pumpkin is thrown horizontally, what is the launch speed needed
An aircraft with a mass of 843 kg accelerates from 0 to 99 m/s in 9.8 seconds, at which time the aircraft launches. What is the kinetic energy of the aircraft when the aircraft launches?
A map of a burned area obtained from remote sensing contains 120 pixels. The remote sensing image shows that the fire is isolated to 73 of the 120 pixels.
Two charged dust particles exert a force of 4.30×10-2 N on each other. What will be the force if they are moved so they are only one-sixth as far apart?
Many people mistakenly believe that the astronauts that orbit Earth are "above gravity." Calculate g for space shuttle territory 150 km above Earth's surface. Assume Earth's mass is 6.0 1024 kg, and
Romeo (75.0 kg) entertains Juliet (52.0 kg) by playing his guitar from the rear of their boat at rest in still water, 2.80 m away from Juliet who is in the front of the boat. After the serenade, Ju
A 2.06 kg particle has a velocity (2.07 ihat - 3.01 jhat) m/s, and a 2.97 kg particle has a velocity (0.94 ihat + 6.05 jhat) m/s. (a) Find the velocity of the center of mass.
The magnetic force acting on a wire that is perpendicular to a 5.2 T uniform magnetic ?eld is 8.0 N. If the current in the wire is 5.0 A, what is the length of the wire that is inside the magnetic ?
The velocity graph of a car accelerating from rest to a speed of 60 km/h over a period of 30 seconds is shown. Estimate the distance, d traveled during this period. (Use M6 to get the most precise
You shoot a 47-g pebble straight up with a catapult whose spring constant is 320 N/m. The catapult is initially stretched by 0.20 m. How high above the starting point does the pebble fly? Ignore air
A 7.4 g bullet leaves the muzzle of a rifle with a speed of 493.1 m/s. What constant force is exerted on the bullet while it is traveling down the 0.8 m length of the barrel of the rifle?
A 200 turn coil of 10cm radius and 20 ohm resistance is perpendicular to a magnetic field that increases uniformly from .2 to .7 T in 0.02 c. what is the induced current in the coil during this tim
An asteroid, whose mass is 7.8 × 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.5 times the Earth's distance from the Sun. (a) Calculate the
The 1.0 kg block in the figure is tied to the wall with a rope. It sits on top of the 2.0 kg block. The lower block is pulled to the right with a tension force of 20 N. The coefficient of kinetic fr
A 4.1 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.3 m/s2, find the force exerted by the rope on the bucket.
A hiker's trip consists of three segments. Path A is 8.0 km long heading 60 degrees north of east. Path B is 7.0 km long in a direction due east. Path C is 4.0 km long heading 315 degrees counterclo