Mechanics | Relativity Answers

Calculate the resultant velocity of an airplane that normally flies at 20 km/h if it encounters a 50-km/h tailwind. If it encounters a 50-km/h headwind

Acceleration due to gravity on planet X is 1/5 that on the surface of the earth. If it takes 4 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s

a golf ball leaves a tee at 60m/s and strikes the ground 200 m away. At what two angles with the horizontal could it have begun its flight? Find the time of flight and maximum altitude in each case.

Hans stands at the rim of the Grand Canyon and yodels down to the bottom.
He hears his yodel echo back from the canyon floor 5.20 s later. Assume that
the speed of sound in air is 340.0 m/s. How deep is the canyon at this
location?

A ball is thrown at 12m/s at an angle of 35 degrees above the horizontal. a) Find its velocity 1.0s later.b) At what time after it was thrown will the ball be headed at an angle of 20 degrees above the horizontal? c) At 20 degrees below the horizontal

While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0m north, 300m east, 210m at angle of 30.0 degrees north of east, and 150m south. Find the resultant displacement from the cave entrance.

A motorist travelling at 72km/h on a straight road approaches a traffic light which turn red when he is 55m away from the stop line.The reaction time is 0.7s.With the brakes applied fully,the vehicle decelerates at 5m/s^2.How far from the stop line will he stop and on which side of the stop line?

Describe and explain how the horizontal and vertical components of a horizontally launched projectile vary with time.

explain about friction with detail

If the momentum of abody increases by 20%,then what is the percentage in its kinetic energy?