What was the most significant accomplishment of the apollo program?

a. building the first space station

b. sending a probe to study the sun

c. landing an astronaut on the moon

d. sending the first astronaut into space

When neutron stars were first predicted theoretically, no scientist expected to be able to detect one of them across interstellar distances. What enabled astronomers to find neutron stars in the late 1960's?

The minute hand of a large clock is 0.50 m long. (A) Calculate its linear speed at its tip in meters per second. (0.000873 m/s) (B) Calculate the centripetal acceleration of the tip of the hand. (1.52 x 10-6 m/s2)

A curium-242 (Z = 96) can be produced by positive-ion bombardment when an alpha particle collides with which of the following nuclei? Note: A neutron is also a product of this bombardment, in addition to the curium-242. A. Pu - 239 B. U - 239 C.

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don't stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?

How does earths movement through space impact the human experience

Objects falling through air experience a type of friction called a. terminal velocity. b. air resistance. c. inertia. d. rolling frictio

Between which pair of objects would the largest gravitational attraction be found

Which of these items are made of cells? Check all that apply

Which of the following is true about high-energy mechanical devices?

Which sequence of coefficients will balance the following equation Ca (s) O2 (g) 2CaO (s)