Two hours of moderate exercise every week can reduce the risk of developing heart disease by 30%.

Which amplitude of the following longitudinal waves has the greatest energy? amplitude = 10 cm; wavelength = 6 cm; period = 4 seconds amplitude = 6 cm; wavelength = 4 cm; period = 10 seconds amplitude = 4 cm; wavelength = 10 cm; period = 6 seconds

Is an 80 dB sound twice as loud as a 40 dB sound? Explain.

In the absence of an external force, a moving object will ... a) stop immediately. b) slow down and eventually come to a stop. c) gradually speed up until it reaches its terminal velocity. d) move with constant velocity in a straight line.

When a listener moves toward the source of a sound wave, the compressions of the wave are spread out. Question 19 options: True False

Which of the following is not part of a star? A. Photosphere B. Corona C. Radiative zone D. Dark spot

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is: