What makes a grenade explode?

Smoke alarms only emit alpha radiation. Why is it important that it does not emit other radiation?

If it takes a planet 2.8 * 108 s to orbit a star with a mass of 6.2 * 1030 kg, what is the average distance between the planet and the star? 1.43 * 109 m 9.36 * 1011 m 5.42 * 1013 m 9.06 * 1017 m

If the activation energy required for a chemical reaction were reduced

A machine launches a tennis ball at an angle of 25° above the horizontal at a speed of 14 meters per second. The ball returns to level ground. Which combination of changes must produce an increase in time of flight of a second launch? A.

A hollow metal ball hangs on a long massless string. The device is driven by a small side-to-side oscillator with a constant very small amplitude and an adjustable frequency. The driver begins to oscillate at a very low frequency.

Acceleration is defined as the rate of change for which characteristic?

No glass is perfectly transparent. Mainly because of reflections, about 92% of light passes through an average sheet of clear windowpane. The 8% loss is not noticed through a single sheet, but through several sheets, the loss is apparent.

Which option determines gravitational pull? A. Acceleration B. The sun C. Volume D. Mass

One number is three times another. Their sum is 144. What are the numbers?

What causes the Coriolis effect? winds spinning off the equator the rotation of Earth on its axis the different air movements north and south of the equator the friction that slows down winds near Earth's surface