A car has an initial velocity of 45m/s and a final velocity of 0m/s 9 seconds later.

a. what is the acceleration?

b. how far did they travel during the 9s?

8. A 300g mass hangs at the end of a string. A second-string hang from the bottom of that mass and supports a 900g mass. (a) Find the tension in each string when the masses are accelerating upward at 0.700m/s2.

Assume that a cloud consists of tiny water droplets suspended (uniformly distributed, and at rest) in air, and consider a raindrop falling through them.

A train 483 m long is moving on a straight track with a speed of 42.4 m/s. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 8.6 m/s.

Middle adulthood marks the time period in which some adults face the fabled midlife crisis. What exactly is that? Do you think you will go through one, or did you have one? Can it be avoided?

What is the potential drop across R3? (R1 = 20 Ω, R2 = 40 Ω, R3 = 60 Ω, V = 60 V) (Ohm's law: V = IR) A. 40 V B. 20 V C. 10 V D. 30 V

Which of the following requires freshwater supplies? A. industry B. agriculture C. both industry and agriculture D. neither industry nor agriculture

A Knight of the Round Table fires off a vat of burning pitch from his catapult at 15.9 m/s, at 30 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s2. How long is it in the air?

When friction is reduced

Compared with ultraviolet radiation, infrared radiation has greater (a) wavelength; (b) amplitude; (c) frequency; (d) energy.

What is the weight on earth of a girl with a mass of 16 kg?