|
Problem 1:
Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Consider the balls while they are both in flight. You may ignore air resistance. Which statements are true about this situation?
True- Both are in free fall
True - As time progresses, the difference between their accelerations increases
False- As time progresses, the distance between them stays constant
False- As time progresses, the difference between their velocities decreases
True - Ball B will hit the ground after ball A
9.8= acceleration due to gravity if you constantly square that the difference in accellerations will increase the distance will change because they will never be at the same velocity/acceleration the velocity difference will increase because they are at a constant acceleration
Problem 2:
You bring a large cannon along with you on a voyage to a distant planet. You set the cannon on a high cliff and you fire a cannonball horizontally off the cliff into an ocean. The cannonball follows projectile motion until it splashes into the water. Which of the following factors will determine the time that the cannonball is in flight? You should ignore atmospheric ("air") resistance.
yes- height of cliff
Depeneds if the force is conatant probably no im guessing- mass of cannonball
yes- planet's acceleration due to gravity
yes- initial velocity of cannonball
no we are ignoring air risitance- radius of cannonball
Problem 3:
Three forces in the x-y plane act on a 4.50 kg mass: 15.10 N directed at 51o, 9.00 N directed at 142o, and 5.60 N directed at 219o. All angles are measured from the positive x-axis, with positive angles in the Counter-Clockwise direction. Calculate the magnitude of the acceleration.
I got the answer for this: 3.086 m/s^2
Draw the graph, connect the vector and it is your answer, the vector solution solution goes from head to head (Length of the resultant is your magnitude)
Calculate the direction of the resultant force using the same sign convention as above (in degrees).
But how do i do this?
Resolve the vector and that will give you the degree
BTW im a little inebreated but that is how you do it, it may not make any sense though
|