Who was the first person to observe the moon through a telescope

Which of these statements is true about endothermic reactions, but not about exothermic reactions? A.) The reactants and products are different substances. B.) The reactants have less energy than the products. C.

Why is it easy to remove air from balloon and difficult from glass bottle

What is the difference between a battery losing charge (discharging) and a capacitor losing charge (discharging) ?

The radius of the earth is r. at what distance above the earth's surface will the acceleration of gravity be 4.9 m/s2? the radius of the earth is. at what distance above the earth's surface will the acceleration of gravity be 4.9 m/s2? 0.50r 0.41r 2.

Give examples to show that friction is both a friend and a foe.

Noah Formula is in an airplane which is flying at constant speed in a circular course of radius 6500 m, circling O'Hare's airplane prior to landing. Noah observed that the plane completes each round trip in 345 seconds (5 minutes & 45 seconds).

Two pieces of metal with exactly the same mass are placed on a surface in bright sunlight. The temperature of the 1st block increases by 3°C while the temperature of the 2nd increases by 8°C. If the specific heat of the 2nd block is 0.

The correctly balanced equation for H202 - H2O + O, is A) H202 - 2H2O + O2 B) H302 - H20+20, C) 2H, 02 - - 4H20 + 0, D) 2H, 02 - 2H30 + 0,

What happens to the wavelength of a wave if you increase the frequency?

In a transverse wave, the particle motion is what to wave motion? A. perpendicular B. parallel