To run the physics cart, the fan speed of the cart is manipulated. This is the variable. The cart accelerates due to the speed o
2 answers:
Answer:
The constant quantity of the cart is its mass m
Explanation:
When the fan of the cart rotates with an increased velocity the force on the cart increases which causes the cart to accelerate. Force and acceleration are variables in this case. Force on the cart is given by the equation
Where m is the mass of the cart and a is acceleration.
In this example, the force is exerted on the cart due to the rotation of the fan. Acceleration is produced due to this force. Thus acceleration is proportional to force.
mass is given by
So the mass of the cart remains constant.
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Answer:
Assumption: the air resistance on this ball is negligible. Take .
a. The momentum of the ball would be approximately two seconds after it is tossed into the air.
b. The momentum of the ball would be approximately three seconds after it reaches the highest point (assuming that it didn't hit the ground.) This momentum is smaller than zero because it points downwards.
Explanation:
The momentum of an object is equal its mass
times its velocity
. That is:
.
Assume that the air resistance on this ball is negligible. If that's the case, then the ball would accelerate downwards towards the ground at a constant . In other words, its velocity would become approximately
more negative every second.
The initial velocity of the ball is . After two seconds, its velocity would have become
. The momentum of the ball at that time would be around
.
When the ball is at the highest point of its trajectory, the velocity of the ball would be zero. However, the ball would continue to accelerate downwards towards the ground at a constant . That's how the ball's velocity becomes negative.
After three more seconds, the velocity of the ball would be . Accordingly, the ball's momentum at that moment would be
.