Explain why a balloon filled with air cannot float in the middle of a room without moving downwards but a helium balloon of the same size can?

Resonance occurs in the middle of the ear true of false

New York's 300m high Citicorp tower oscillates in the wind with a period of 6.8s. Calculate the frequency of the vibration.

Which of the following are units for expressing rotational velocity, commonly denoted by ω?

Is 0.0 m/s squared increasing or decreasing

2 Which of these is one of Newton's laws of motion? A An object's momentum is the product of its mass and velocity. B A moving object will continue moving until a force acts upon it.

A 3 column table with 5 rows labeled table A. The first column is labeled voltage in volts with entries 1.0, 5.0, 10, 20, 50. The second column is labeled current: calculated in amps with no entries.

When you stack three flashlight batteries in the same direction, you get a voltage of 3*1.5 volts = 4.5 volts. What voltage do you get if one of the batteries is turned to face in the opposite direction? a) 0 volts b) 1.5 volts c) 3 volts d) - 4.

If an ant were scaled up to the size of an elephant, the ant would be

A 4.0 kg food pack was dropped from a height of 200 m by a helicopter during flood relief operations. At what velocity will the food pack be falling halfway to the ground?

The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true? The mechanical waves reach Earth, while the electromagnetic waves do not.