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A 1100-kg car pulls a boat on a trailer.
(a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2 ? The mass of the boat plus trailer is 700 kg.
(b) What is the force in the hitch between the car and the trailer if 80% of the resisting forces are experienced by the boat and trailer?
A skateboarder shoots off a ramp by a velocity of 6.8 m/s, directed at an angle of 54° above the horizontal. The end of the ramp is 1.1 m above the ground. Let the x axis be parallel to the ground, they direction be vertically upward, and take as the..
A playground is on the flat roof of a city school, 4.6 m above the street below (see figure). The vertical wall of the building is h = 6.10 m high, forming a 1.5-m-high railing around the playground. Find the vertical distance by which the ball cle..
What is the terminal speed of a 5.6 kg spherical ball with a radius of 3.0 cm and a drag coefficient of 1.55? The density of the air through which the ball falls is 1.2 kg/m3
a point charge q1 2.40 microc is held stationary at the origin. a second point charge q2 -4.30 microc moves from the
The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth. How much time does the beetle have to react in this case
A spacecraft moving away from Earth emits a 4484 Hz signal. A scientist on Earth measures thesignal to be 4479 Hz. What is the speed of the spacecraft relative to Earth
A small compass is held horizontally, the center of its needle adistance of 0.120 m directly north of a long wire that isperpendicular to the earth's surface.
A speck of dust on a spinning DVD has a centripetal acceleration of 20 m/s^2. A) What is the acceleration of a different speck of dust that is twice as far from the center of the disk? B) What would be the acceleration of the first speck of dust if t..
A skier of mass 125 kg travels down a ski trail. Suppose the ski trail is not frictionless. If the skier has a speed of 50 m/s at the bottom of the hill, What is the work done by friction on the skier
a wooden rod of negligible mass and length 84.0 cm is pivoted about a horizontal axis through its center. a white rat
Find the motional EMFinduced between the ends of the cable. Assume, and state, what the angle should be between the cableand the magnetic field to get the largestEMF
You are playing by a lens and you find that for a certain position of an object in front of it you can project the image on a screen. The image is twice the size of the object, Is the lenses convergent or divergent (concave or convex)?
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