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Q1. The driver of an 1800 {kg} car travelling on a horizontal road at 100 kmh suddenly applies the brakes. Because of a slippery pavement, the friction of the road on the tires of the car, which is what slows down the car, is 20.0 percent of the weight of the car.
What is the acceleration of car?
Q2. A 1400 {rm kg} wrecking ball hangs from a 16 {rm m}-long cable. The ball is pulled back until the cable makes an angle of 27.0^circle with the vertical. By how much has the gravitational potential energy of the ball changed?
A wooden block with m1 = 3.1kg is sliding across a frictionless surface in the ?x direction at 5.2 m/s. What is the velocity of the m2 block in the lab frame after the collision
A spherical shell has an outside radius of 2.6cm and an inside radius of a. The shell wall has uniform thickness and is made of a material with density 4.70g/ cm3. The space inside the shell is filled with a liquid having a density of 1.23g/cm3.
A 0.49 kg mass at the end of a spring vibrates 9.0 times per second with an amplitude of 0.20 m. Determine the total energy of the system
A cup of water is heated with a heating coil that delivers 27.28W of heat. What is the mass of the water
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 32.5 dB. What is the intensity delivered to the eardrum
A 35 ? lamp and a 90 ? lamp are connected in series and placed across a potential of 40 V. What is the voltage drop across the first lamp
A 0.144 kg baseball is moving towards home plate with a speed of 43.0 m/s when it is bunted. The bat exerts an average force of 6.50 Ã? 103 N on the ball for 1.30 ms, What is the final speed of the ball
Suppose that the specific heat capacity cp Of the body discussed in Section 7.6 of the text is 10 J kg-1 K-1and T1 =200 K. Find the entropy change of the universe in both cases
The intensity of sunlight at the Earth's surface on a fairly clear day is 1000W/m2. [20pts], What is the maximum value of the electric field
A beam of white light is passed through a prism at an angle of 30o and separated into a spectrum. What is the index of refraction for each color
A 168 kg polar bear standing 1.2 meters tall walks onto a floating sheet of ice 0.305 m thick. What is the surface area of the ice floe
In a head-on collision, a car stops in 0.30{\rm s} from a speed of 30{\rm m}/{\rm s}. What force is applied to the driver by his seat belt during that fraction of a second
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