While driving in your car you notice that your car’s speedometer is not working, thus being a clever physics student you deduce the speed of the car from its rev meter. If the radius of the car is 35 cm and the rev meter reading is 800 rpm. What is the linear velocity of the car?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%

Explain the difference in reactivity of the elements based on their electron configurations.