A sports car accelerates from zero to 30 mph in 1.5 s. How long does it take for it to accelerate from zero to 60 mph, assuming the power of the engine to be independent of velocity and neglecting friction? A. 2 sB. 3 sC. 4.5sD. 6 sE. 9 s

A volcano launches a lava bomb straight upward with an initial speed of 28m/s. Taking upward to be the positive direction, find speed and direction of motion of the lava bomb. a) 2.0seconds and b) 3.0seconds after it is launched

Which event is an example of a contact force? A. a nail being attracted to a magnet B. a leaf falling from a tree C. an electric charge jumping from a sweater to a person D. a person pulling a sled

A cyclist travels 36km in 3 hours. What is the cyclist's average speed?

One disadvantage of this type of power is that it still pollutes the air. Select one: A. biomass B. geothermal power C. hydropower D. solar power

The scientists makes an educated guess in " if, then" form. Which step of the scientific method is described?

A nuclear power plant generates a total of 150mw of power and 45% of this power is wasted heat that is discharged on the cooling water of a river. the river flows at 660.43 gal/s and has an upstream temperature of 64.4 ⁰f.

The universe is believed to have been form from a very dense fireball billions of years ago.

What does the slope of the line on this velocity versus time graph represent? A. positive deceleration B. zero acceleration C. positive acceleration D. negative acceleration

Which of the following objects has the greatest kinetic energy? a baseball flying through the air at 90 miles per hour a baseball flying through the air at 45 miles per hour a baseball flying through the air at 20 miles per hour a baseball sitting

Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders is 5,600 kg.