Trick Questions

Question 1

Jack’s yearly salary added to Amy’s yearly salary makes $99,000. Amy makes 25% more than Jack. What is Amy’s salary?

Answer 1

55000 dollars

Question 2

A cannon ball is shot horizontally from the edge of a cliff. After the cannon ball leaves the cannon, what is the acceleration of the ball in the horizontal direction? (neglect air friction)

Answer 2

0

Question 3

Suppose you know the initial vertical velocity of an object near the surface of the earth, with 𝑦 vertical. Which single formula could you use to find the maximum height of the thrown object?

Answer 3

𝑣2𝑦𝑓=𝑣2𝑦𝑖+2𝑎𝑦(𝑦𝑓−𝑦𝑖)

Question 4

Find a formula for the initial cannonball speed 𝑣0 that will make the cannonball hit the target. Hint: put all of your variables inside the square-root.

Answer 4

L/(sqrt((2*h)/g))

Question 5

Imagine you are standing on a frictionless surface and a lightweight roller cart moves directly towards you. How can you stop the cart?

Answer 5

Catch the cart and then push it away from you just enough so that the cart is stationary after you let it go and you are moving away.

Question 6

Two mases on a cord, M2—T2—>M1—T1—>F. How does T1 and T2 compare?

Answer 6

𝑇1>𝑇2 because 𝑇2 pulls to the left on the small mass.

Question 7

A 320-pound BYU lineman runs off the field, crashing into a 90-pound cheerleader.

Answer 7

There are equal forces on the cheerleader and lineman.

Question 8

Consider a rock sitting perfectly still on the ground. The Newton’s third law pair corresponding to the force of gravity on the rock is:

Answer 8

The gravity force the rock exerts on the earth.

Question 9

(i’m on prequiz 11)

Answer 9

(ok)