Who was the first russian to orbit the earth

A sample contains 10 g of a radioactive isotope. How much radioactive isotope will remain in the sample after 2 half-lives? A. 7.5 g B. 5.0 g C. 2.5 g D. 10.0 g

If i go to the moon what happens to my mass and weight

An artillery shell is fired at an angle of 62.7 above the horizontal ground with an initial speed of 1520 m/s. The acceleration of gravity is 9.8 m/s2. Find the total time of flight of the shell, neglecting air resistance. Answer in units of min ...

About how many weeks does it take the Moon to go from a full Moon phase to a third quarter phase? A. 1 B. 2 C. 3 D. 4

If there was no gravity acting on the object and it was launched at an upwards angle of 30 degrees, explain its path. The object would move downward at the same angle.

if light travels in a vacuum at 3.00 x 10^8m/s and its frequency is 7.44 x 10^7 what is its wavelength

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