A toy helicopter begins flying across a field with a speed of 3 m/s and an acceleration of 0.8 m/s2. How long does it take the helicopter to reach a speed of 7 m/s?

The conversion of thermal energy into mechanical energy requires a a. thermometer. b. heat engine. c. vaporizer. d. thermostat.

When you jump straight up as high as you can, what is the order of magnitude of the maximum recoil speed that you give to the Earth? Model the Earth as a perfectly solid object.

Ninety-nine percent of the radiation from the sun consists of visible light, ultraviolet light. true or false?

How many degrees are in each quadrant A: 90° B: 30° C: 180° D: 360°

Provide support to the argument that Cornell university did violate ethical requirements for research

Explain why it's important that the alveoli is only 1 cell thick

A new cannon was being developed in a science lab. The instructor wanted to do some testing of the cannon's ability to launch objects with different masses. The instructor used tennis balls and filled them with lead, rocks, and styrofoam.

Which law is being demonstrated when a swimmer moves forward through the water?

A camcorder has a power rating of 16 watts. If the output voltage from its battery is 7 volts, what current does it use?

Electromagnetic waves with low frequencies have been used for long-distance underwater communication. These waves most likely belong to which of the following parts of the electromagnetic spectrum? A. gamma rays B. infrared waves C. radio waves D.