supposed to vacuum cleaner uses 120 J of electrical energy. If 45 J used to pull air into a vacuum cleaner, how efficient is the vacuum cleaner?

What does H-R diagram stand for?

A 2.0-kg object moving at 5.0 m/s encounters a 30-Newton restive force over a duration of 0.10 seconds. The impulse (magnitude only) experienced is object is approximately N-s

Why is creativity important in constructing scientific questions? A. Experiments are supposed to have as little creativity as possible. B. The obvious questions do not always lead to interesting results. C.

How many series connected 2v cells does a typical 24 storage battery contain

Heat from burning fuel warms the walls of the firebox section of the furnace in

A car is moving with a speed of 22 m/s. The driver then brakes, and the car comes to a halt after 6.5 s. What is the distance covered by the car after the driver brakes, until it comes to a stop? A) 36 m B) 72 m C) 140 m D) 210 m

Which of the following best explains why an explosive charge in a cannon can cause a cannonball to fly out of the cannon with a high velocity? A. because chemical potential energy can convert to gravitational potential energy B.

Distance divided by time what is velocity

The decay constant of a radioactive nuclide is 4.6 x 10^-3 s^-1. What is the half-life of the nuclide? 2.5 min 2.0 min 1.4 min 3.6 min 3.1 min

A furlong is an old british unit of length equal to 0.125 mi, derived from the length of a furrow in an acre of ploughed land. a fortnight is a unit of time corresponding to two weeks, or 14 days and nights.