The total amount of fresh water on earth is estimated to be 3.73 x 10^8 km^3. What is this volume in cubic meters? in cubic feet?
In electromagnetic waves, frequency is inversely proportional to A: Amplitude B: Wave Speed C: Wavelength D: Reflection
During which season is the sun highest in the sky? A. spring B. summer C. fall D. winter (this is science)
If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this overtone is the A. third harmonic. B. second harmonic. C. fourth harmonic.
Two carts collide on a level, friction-less track. Cart A has a mass of 200 g and is initially stationary. Cart B has a mass of 100 g and is initially moving with a velocity of +2.0 m/s. After the collision between the carts, cart B has a velocity of -0.5 m/s. Calculate the velocity of cart A after the collision. (Use conservation of momentum, KE is not conserved.)
A 900 kg car is traveling west at 25 m/s. An SUV with a mass of 1,500 kg is traveling at 10 m/s east, heading straight for the car. The car and SUV collide and stick together. A.) Momentum of the car before collision= B.) Momentum of SUV before collision= C.) Determine the speed of the car and SUV after the collision.
Please explain the answers. Thank You 1. A rifle is fired horizontally over a large flat plane. At the instant the rifle is fired, a student drops a second identical bullet from the same height as the rifle. Which bullet hits the ground first? 2. A monkey is hanging from a tree branch. A scientist wants to shoot the monkey with a tranquilizer dart so she can study the monkey. She knows the monkey will be startled by the sound of the tranquilizer gun and will let go of the branch at the instant the gun is fired. Where should the scientist aim to hit the monkey? (Above it, below it or directly at it?) 3. a golfer hits a golf ball an initial velocity of 54m/s [42 degrees above the horizontal]. the ball lands on an elevated green that is 14m higher that the level from which the golfer hit the ball. a) how far away horizontally from the golfer does the ball land? b) what is the velocity of the ball when it lands? please show all the steps
