Quinn launches two projectiles, x and y, at two different speeds. which best compares the motion of the projectiles?

a. the horizontal velocity of projectile x is changing, and the vertical velocity of projectile y is constant.
b. the vertical velocity of projectile y is changing, and the horizontal velocity of projectile x is constant.
c. the horizontal acceleration of projectile x is –9.8 m/s2, and the vertical acceleration of projectile y is 0 m/s2.
d. the horizontal acceleration of projectile y is –9.8 m/s2, and the vertical acceleration of projectile y is 0 m/s2.

True or false graphs must include scales that increase by the same amount

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

A15 ohm resistor and a 25 ohm resistor are connected in a series to a 60 volt battery. what is the power used by each device