A car rounds a 75 m radius curve at a constant speed of 18 m/s. A ball is suspended by a string from the ceiling the car and moves with the car. The angle between the string and the vertical is: Select one: a. cannot be found without knowing the mass of the ball b. 24° с. 0° O d. 90° е. 1.4°

A ball on a string moves around a complete circle, once a second, on a frictionless, horizontal table. The tension in the string is measured to be 6.0 N. What would the tension be if the ball went around in only half a second? A. 1.5 N B. 3.0 N C. 12 N D. 24 N

2) A roller coaster is going over a hill with a radius of 20 m.     a. How fast does it have to go for the passengers to feel weightless at the top? b. Suppose the roller coaster was running on the Moon, where the acceleration of gravity is only 1.7 m/s^2. How fast would it need to travel for you to feel weightless there?

In the image is a stopper attached to a fishing line that is threaded theough a glass rod. Hanging from the end of the line opposite the stopper is a 100-gram mass. The stopper is being whirled in a horizontal circle, first quickly, then decreasing to a slower speed. a. Is the string pulling inward on the stopper? b. Is there a force pulling the stopper outward? c. True or false: The inward force and outward forces balance, and since the speed is constant, there's no acceleration and there is equilibrium.

Pls help ASAP.

At what maximum speed can a car exit onto a 40-m-radius circular freeway ramp without sliding if the coefficient of static friction between the tires of the car and the road is 0.90?    a. 18.8 m/s   b. 11.4 m/s   c. 15.3 m/s   d. 22.0 m/s   e. 13.2 m/s

A jet flying at 130 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.86 × 105 kg. Calculate the magnitude of the necessary lifting force. L -

help with physics hw

Solve this problem please

Two cars are traveling around a vertical loop of radius 5 m. A.) Determine the minimum speed the green car must be going to not fall. Vgreen, min = B.) Determine the normal force on the 1150 kg red car if its going 10.5 m/s. FN =