When is an object moving in uniform circular motion?

A. when it speeds up around a curve

B. when its tangential speed is constant

C. when it has no net force acting on it

D. when its acceleration is tangent to a circle

Is it possible to do work on an object that remains at rest?

Which of the following is NOT true about energy conversion devices? a. Total Energy Input = Useful Energy Output b. Total Energy Input = Total Energy Output c. Total Energy Input = Useful Energy Output + Energy Dissipated to the surroundings d.

If velocity is positive, which woul vost likely yield a negative acceleration? A final velocity that is faster than an initial velocity. A time that is less than a half hour. An initial velocity that is faster than a final velocity.

According to Newton's first law of motion, if a person is swinging a rock st the end of a string and the string breaks, what will the tendency of the rock be

950 - kg toyota collides into the rear end of a 2200-kg cadillac stopped at a red light. THe bumpers lock, the brakes are locked and the two car skid forward 4.8 meteres before stopping.

A transparent film laminated to a fabric is identified in the study material as a. stretch fabric. b. PVC. c. a skin. d. two-faced fabric

Light from the sun travels through space to Earth's atmosphere. Which will light waves do when they move from empty space into matter made up of different gases? A. move at the same speed B. move faster as they transmit C. slow down and refract D.

A 12.5 kg box sliding on a frictionless flat surface tuns into a fixed spring which compresses at a distance x = 14.1 cm. the spring constant is 94.5 kN/m Find the initial speed of the box

An earth scientist who studies hydrosphere

In 1991 four English teenagers built an eletric car that could attain a speed of 30.0m/s. Suppose it takes 8.0s for this car to accelerate from 18.0m/s to 30.0m/s. What is the magnitude of the car's acceleration?