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A car is traveling around a banked curve. The angle of the curve is adjusted to be optimum for a velocity of 45 miles/hour. If the car goes around the curve at a speed of 30 miles/hour, which of the following forces will have to exist to allow the car to safely negotiate the curve? a. An additional frictional force up the slope. b. An additional frictional force down the slope. c. An increased normal force on the car. d. The wouldn’t have to be any changes in the forces. If the motion of the car is such as to cause an additional frictional force down the slope of the curve, what would happen to the magnitude of the normal force? a. The normal force would have to decrease. b. The normal force would remain the same. c. The normal force would have to increase.
You are designing a curve in a highway. If the turn is too sharp (the radius of curvature is too small), Find the minimum radius of curvature of a road
A ball is tied to the end of a cable of negligible mass. What is the magnitude of the acceleration of the ball
A bicyclist is sitting on her bike on the side of the road when she sees her friend riding up behind her on his bike at a constant speed of 6.9 m/s. How long does it take her to catch up with him
Mass 1 is a 15.0 g marble sliding to the left with a velocity of magnitude 0.72 m/s on the frictionless, Calculate the momentum of the marbles before the collision
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A terrestrial telescope uses an objective and eyepiece with focal lengths of 42cm and 6.0cm, respectively. find the magnification of the telescope for an object at infinity
A 9.0-g piece of Styrofoam carries a net charge of -.65mC, What is the charge per unit area on the plastic sheet
The bowling ball has a diameter of 20.6 {rm cm}, and the angle the stick makes with the horizontal is 30.0 {rm ^circ}. You may suppose there is no friction between the stick and the bowling ball, though friction with the floor must be taken into acco..
A textbook of mass 2.05 kg rests on a frictionless, horizontal surface. What is the tension in the part of the cord attached to the book
Find the center of mass of a system composed of three spherical objects with mass of 3.0kg, 2.0kg, and 4.0kg
a 500 g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle the tension in the string is 15 N. What is the speed of the ball at that point?
a projectile is shot upward off a 475 m high cliff with a speed of 65m/s at an angle of 48 with respect to the horizontal. What is the velocity of the pojectile upon landing
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