How to prevent electric shock

A piece of metal is vibrating with a high frequency. the sound it emits will have a (n) ___.

A spherical balloon is filled with gas at a rate of 4 cm 3 / s. at what rate is the radius r changing with with respect to time when the volume v = 36 π cm 3?

Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation, in kW, from 1.02 m2 of 1000ºC fresh lava into 25.3ºC surroundings, assuming lava'semissivity is 0.97.

Explain how the height of an ocean wave determines the motion of a surfer on the wave?

Where would aliens be if they really do exist here on Earth?

Why does life be life

How are hypotheses and theories related to each other?

During the refrigeration cycle, what does the refrigerant do? Absorbs and releases thermal energy by first vaporizing then condensing. Absorbs and releases thermal energy by first condensing then vaporizing.

Find the unbalanced force required to accelerate a 6kg mass at 3ms

A bus travels 300 km south along a straight path with an average velocity of 85 km/h to the south. The bus stops for 22 minutes. Then it travels 220 km south with an average velocity of 78 km/h to the south.