Physics Final
If a satellite moves with constant speed in perfectly circular orbit around the earth, what is the direction of the acceleration of the satellite...
Inward toward the earth
For general projectile motion with no air resistance, the horizontal component of a projectile's acceleration...
Is always zero
When a ball is thrown straight up with no air resistance, the acceleration at its highest point...
Is downward
A spaceship is traveling to the moon. At what point is it beyond the pull of earths gravity?
It is never beyond the pull of Earths gravity
Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
It's acceleration is positive
A person who normally weighs 700N is riding in a rather swift elevator that is moving at a constant speed of 9.8 m/s. If this person is standing on a bathroom scale inside the elevator, what would the scale read?
700N
The slope of a velocity versus time graph gives...
Acceleration
An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?
Average acceleration
A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting air resistance, when the package hits the ground the horizontal location of the plane will...
Be directly over the package
Mary and Debra stand on a snow covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30 degrees below the horizontal; Debra throws her snowball upward, at 30 degrees below the horizontal. Which of the following statements are true about just before the snowballs reach the ground below?
Debra's snowball will stay in the air longer than Mary's snowball
The area under a curve in a velocity versus time graph gives...
Displacement
Suppose a ball is thrown straight up an experienced no appreciable air resistance. What is its acceleration just before it reaches its highest point?
Exactly g
Two snowballs, A and B attract each other gravitationally with a force of magnitude F. If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force on each one?
F. Fg= Gm1 x m2/ r^2
A golf club hits a ball with a force of 2400N, sending it into the air. The force exerted on the club by the ball must be less than 2400N or else the ball wouldn't have moved forward.
False
If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
False
If the velocity of an object is zero, then that object CANNOT be accelerating.
False
In order to get an object moving, you push harder on it than it pushes back on you.
False
A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down. Which of the following statements about the rock's motion are true just before it hits the ground?
It's horizontal velocity component is the same as it was just as it was launched.
The boxes P and Q on a perfectly smooth horizontal surface, connected by a light horizontal card. P has a greater mass. Force F is applied to box Q. The magnitude of the force exerted by the card on body P is...
Less than F but not zero
The acceleration due to gravity is lower on the moon than in earth. Which of the statements are true about the mass/weight of the austronaut?
Mass is the same, weight is less
You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it...
Moves along a straight line path tangent to the curve
A player kicks a soccer ball in a high arc toward the opponents goal. At the highest point in its path...
Neither the balls velocity not its acceleration are zero
A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road?
Perpendicular to the curve inward
For general projectile motion with no air resistance, the horizontal component of a projectiles velocity...
Remains a non zero constant
You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. Form this observation, you can conclude that this train is...
Slowing down
Three boxes are pulled along a horizontal friction floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which statement about tension is true?
T1 > T2
Suppose that an object is moving with a constant velocity. Which statement concerning its acceleration must be correct?
The acceleration is equal to zero
The reason an astronaut in an earth satellite feels weightless is that...
The astronaut is falling
A satellite is in orbit around the Earth. Which one feels the greater force?
The earth and the satellite feel exactly the same force.
A person is running on a track. Which of the following forces propel the runner forward?
The force of friction exerted by the ground in the person
An object is moving with constant non-zero velocity. Which must be true?
The net force on the object is zero
You push on box G is next to box H, causing both to slide. The reaction force to your push is...
The push of box G is against you
If you pound a feather with a hammer, which one feels a greater force?
The size of the force is always the same on both of them.
The motion of a car and truck along a straight road are represented by the velocity - time graphs in the figure. The two vehicles are initially alongside each other at time t=0. At time T, what is true of the distances traveled by the vehicles since time t=0?
The truck will have traveled farther than the car
Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp t allowed to slide down from rest without air resistance. Which statement is true?
The two objects reach the bottom of the ramp at the same time
An object of weight w is in free fall close to the surface of Earth. The magnitude of the force that the object exerts on Earth is...
Zero
