Radar use reflected microwaves to detect objects and measure their ... what?

A. Distance and speed

B. weight and volume

C. Wavelengths and frequency

D. Height and depth

For any two materials, the force required to overcome sliding friction is always larger than the force required to overcome starting friction. a. True b. False

Huge loops or sheets of gas erupting from active regions around sunspots. These features arch into the Sun's atmosphere and connect pairs of sunspots.

During the polarization of an object, what happens to the charges that the object carries? A Negative charges flow toward positive charges. B Positive and negative charges become separated. C Both negative and positive charges are produced.

When two horizontal forces are exerted on a cart, F1 = 650 N forward and F2 = 400 N backward, the cart undergoes acceleration.

Overfishing-which threatens many deep-water fish species-is in some way a direct reaction to what phenomenon? a. the interdependence of countries and an increase in the world population b.

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.