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Physics Berg 54 chap3 Questions
An object moving in the +x direction experiences an acceleration of +2.0 m/s squared. This means the object - โ โ Is increasing its velocity by 2. m/s every second
A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s squared. How much time is required for the car to reach a speed of 90 km/hr?
A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. - โ โ 0.30 m/s squared, south
A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start. The car reaches a speed of 140 km/hr as it passes marker 2. Where on the track was the car when it was traveling half this speed? - โ โ Before marker 1
A raquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 m/s. What is the average acceleration of the ball during the collision with the wall? - โ
โ 2800 m/s squared
Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds - โ โ Remains constant
Brick A is dropped from the top of a building, Brick B is thrown straight down from the same building and neither experience air restance. Make a statement about their acceleration. - โ โ The two bricks have exactly the same acceleration.
From the edge of a roof top you toss a green ball upwards with initial seed v and ablue ball downwards with the same initial speed. Air resistance is negligible. when they reach the ground below - โ โ The two balls will
have the same speed.
A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s squared. How fast is the car moving just as it has traveled 3.50 km? - โ โ 62.5 m/s
A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s squared. How long after beginning to accelerate does it take the car to move 3.50 km? - โ โ 1.00*10squared seconds
A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s squared for 15 s. At the end of this time, what is its velocity? - โ
โ 45m/s
A cart starts from rest and accelerates uniformly at 4.0 m/s squared for 5. s.. It next maintains the velocity it has reached for 10 s. Then it slows down at a steady rate of 2.0 m/s squared for 4.0 s. What is the final speed of the car? - โ โ 12 m/s
Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. - โ โ The acceleration is equal to zero.
The captain orders his starship to accelerate from rest at a rate of "1g" (1g=9. m/s squared). How many days does it take the starship to reach 10 % the speed of light? (Light travels at 3.0*10 to the eighth m/s) - โ โ 35 days
The following situation is impossible - โ โ An object has constant non-
zero velocity and changing acceleration
The slope of a position versus time graph gives - โ โ Velocity
The slope of a velocity versus time graph gives - โ โ Acceleration
The slope of a velocity versus time graph gives - โ โ Acceleration
Two objects are dropped form a bridge, an interval of 1.0s apart. Air resistance is negligible. During the time that both objects continue to fall their seperation... - โ โ Increases
Two objects are thrown from the top of a tall building. One is thrown up and the other is thrown down, boh with the same initial speed. What are their speeds when they hit the street. neglect air resistance. - โ โ They are traveling at the same speed.
Under what condition is average velocity equal to the average of the object's initial and final velocity? - โ โ The acceleration is constant
A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Make a statement about this rock while it is in the air. - โ โ The acceleration is downward at all points in the motion.
A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration? - โ โ 1500 m/s squared
An airplane increases its speed at the average rate of 15 m/s squared. How much time does it take to increase its speed from 100 m/s to 160 m/s? - โ
โ 4.0 seconds
An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s squared. It travels a distance of 1.033 km while accelerating. How many seconds did it take to travel the 1.033 km? - โ โ 45 s
A certain test car can go from rest to 32.0 m/s in 3.88 s. The same car can come to a full stop from that speed in 4.14 s. What is the ratio of the magnitude of the starting acceleration to the stopping acceleration? - โ
โ 1.
A jet plane is launched from a catapult on an aircraft carrier. in 2.0 s it reaches a speed of 42 m/s at the end of the catapult. Assuming the acceleration is constant, how far did it travel during those 2.0s? - โ โ
42m
A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock? - โ โ a
milliseconds does it take the bullet to come to rest in the sandbag? - โ โ 0.400 ms
In a ballistics test, a bullet moving horizontally with a a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm.what is the magnitude of the average acceleration of the bullet in the sandbag? - โ โ 1.25* to the sixth m/s squared
Suppose a car traveling to the west (-x directions) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. - โ
โ Its acceleration is positive.
An auto accelerates forward from 7.0 m/s at a uniform 0.71 m/s squared. It travels a distance of 1.033 km while accelerating.how fast is the auto moving just as it traveled the 1.033 km? - โ โ 39 m/s
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?
- โ โ Average acceleration
An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is a - โ โ A parabolic
curve
When a ball is thrown straight up with no air resistance, the acceleration at its highest point is - โ โ Downward
A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s squared to the right. What is the cart's displacement during the first 6.0 s of this motion? - โ โ 66 m
A ball is thrown downward in the absence of air resistance. After it has been released, make a statement concerning it's acceleration. - โ โ Its
acceleration is constant.
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration of the ball as it is going - โ โ It's velocity points upward
and its acceleration points downward.
