Two rocks of masses 5kg and 10kg are dropped off a cliff at the same time.  1.  Which rock will hit the ground first? a)5kg rock b)10kg rock c) they will hit at the same time   Justify your answer.    2.  One of the rocks is now dropped from twice the original height (2H).  How does the time it takes to hit the ground (t2) compare to the original time (t1)? a) t2 = 2t1         b) t2 <2t1          c) t2 > 2t1   Justify your answer.

General Physics Question: Please see attached image

Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 3.21 cm/year. Hint a. What distance does it move in 1.71 s at this speed in nanometers? It moves a distance of nm. b. What is its speed in kilometers per million years? Its speed is km/million years.

Two stones are released from rest, at the same height above the ground, one after the other. Will the time interval between the instants at which they hit the ground be Choose one: a. Greater than the time interval between the instants of their release? b. Equal to the time interval between the instants of their release? c. Smaller than the time interval between the instants of their release?   A golfer gives a golf ball a velocity of 48 m/s at an angle of 40° with the horizontal. What is the vertical component of the ball's initial velocity? Choose one: a. 31 m/s b. 48 m/s c. 36 m/s d. 36.7 m/s   A sprinter accelerates from rest at 6.0 m/s2. How long will it take the sprinter to reach a velocity of 8.0 m/s? Choose one: a. 14 s b. 1.3 s c. 0.75 m/s d. 48 s

A rock has a mass of 17 kg on a planet. The acceleration due to gravity (g) on the planet is 7m/s^2.. Assuming the rock does not physically change, how much mass will it have on Earth? Choose one correct answer with correct unit of measure.   A. 116.6 kg   B. 17 kg   C. 119 pounds   D. 17 N

Match the following behavior with the physics concept it illustrates          -           A.           B.           C.           D.           E.       Acceleration of a rocket at launch          -           A.           B.           C.           D.           E.       Rebound of a basketball off the backboard          -           A.           B.           C.           D.           E.       Occupant protection in an automobile crash          -           A.           B.           C.           D.           E.       Proportional to velocity          -           A.           B.           C.           D.           E.       Proportional to square of velocity A. Conservation of momentum and thrust B. Elastic collision C. Inelastic collision D. Energy E. Momentum

I need help with these questions and I need an explanation Is the answer for 8: A. -20 m/s/s B. 3.33 m/s/s C. -6.7 m/s/s D. 20 m/s/s Is the answer for 6: A. 8 m/s B. 40 m/s C. 20 m/s

Suppose you have collected the set of data below by measuring the amount of time it takes for a small steel ball to fall from a height of 1.5 m to the ground. What value would you report if I asked you for the fall-time of this small steel ball from a height of 1.5 m?

Science chapter 2 review 7. Suppose a robot arm can put a toy together five times as fast a person. If a persom can make 56 toys in 8 hours, how many toys can the robot make in the same amount of time? 8. How would an engineer use the design process to build a car that uses less gas? 10. Tell how a technology has affected human life.

What is the acceleration (in units of feet per second squared) of a car that goes from 16 mph to 75 mph in a 10.0 second time period? How far does the car travel during that acceleration in units of feet? Make a list of all given values, units, and the variables they represent. Write the general form of the equation you are going to use. Solve the equation.