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A 1,488-kg car is moving down a road with a slope (grade) of 21% while speeding up at a rate of 1.5 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., down the slope)?
A boy of mass 54.7 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. Find the final velocity of the skateboard
A spark plug in an automobile engine consists of two metal conductors that are separated by a distance of 1.1 mm, What is the magnitude of the potential difference V between the conductors
A concave mirror has a radius of curvature of 32.0cm. What is its focal length?
A thin, flat, uniform disk has mass M and radius R. Find the moment of inertia of the disk with the hole about an axis through the original center of the disk, perpendicular to the plane of the disk
The spring of the pressure gauge shown in has a force constant of 1 400N/m, and the piston has a diameter of 1.60cm. When the gauge is lowered into water in a lake, what change in depth causes piston to move in by 0.850cm.
A 10-m long plank with a mass of 15-kg is supported at each. A 70 kg person stands on the plank between the supports. how far is the person standing from the left support
The sun falls on a concave mirror and forms an image 4.5 cm from the mirror. If an object 22 mm high is placed 12.7 cm from the mirror, where will its image be produced.
An ideal transformer has 50 turns in its primary and 400 turns in its secondary. 8.0- ac is connected to the primary. What is voltage available at the secondary
Two lightbulbs operate on the same potential difference. What is the ratio of the current in bulb A to the current in bulb B
a lens of focal length 1500 mm is used to project an image of the sun. If the sun subtends an angle of .50, what is the diameter of the image
A ball of weight 1.5 N is thrown at an angle of 30° above the horizontal with an initial speed of 12 m/s. the net force (ignoring air resistance) on the ball is:
A semicircular loop lies in the z = 0 plane and carries a current I 50 A . When a magnetic flux density B = 2ay + az T is applied, what is the torque on the loop
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