A 400 kg vehicle is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is

A 400 kg vehicle is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is  A)...

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?  A) air...

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is  A) less than 1000 N. B) more...

Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of massless rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of massless rope on frictionless ice. After a brief time, they meet....

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the  A) combined...

Wherever there is an action force, there must be a reaction force that

Wherever there is an action force, there must be a reaction force that  A) always acts in the same direction. B) is slightly smaller in magnitude...

A feather and a coin will have equal accelerations when falling in a vacuum because

A feather and a coin will have equal accelerations when falling in a vacuum because  A) their velocities are the same. B) the force of gravity...

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then  A) 90 N. B) 250 N. C) 410 N. D)...

If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity

If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity  A) the object accelerates in the direction...

If an object of constant mass experiences a constant net force, it will have a constant

If an object of constant mass experiences a constant net force, it will have a constant  A) velocity. B) speed. C) acceleration. D) position. E)...

A 2000-kg car experiences a braking force of 8,000 N and skids to a stop in 5 seconds. The speed of the car just before the brakes were applied was

A 2000-kg car experiences a braking force of 8,000 N and skids to a stop in 5 seconds. The speed of the car just before the brakes were applied was  A)...

If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g to a full stop, the skidding time in seconds is

If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g to a full stop, the skidding time in seconds is  A) about 3. B) about...

A skydiver of mass 100 kg experiences air resistance of 600 N, and an acceleration of

A skydiver of mass 100 kg experiences air resistance of 600 N, and an acceleration of  A) 6 m/s^2 B) 3 m/s^2 C) 500 m/s^2 D) 4 m/s^2 E) 10 m/s^2 Answer:...

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its...

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction...

A 10-N block and a 1-N block lie on a horizontal frictionless table. To provide them with equal horizontal acceleration, we would have to push with

A 10-N block and a 1-N block lie on a horizontal frictionless table. To provide them with equal horizontal acceleration, we would have to push with  A)...

A bag of groceries has a mass of 10 kilograms and a weight of

A bag of groceries has a mass of 10 kilograms and a weight of  A) about 1 N. B) about 10 N. C) about 100 N. D) about 1000 N. E) more than 1000...

A bag of groceries has a mass of 10 kilograms and a weight of

A bag of groceries has a mass of 10 kilograms and a weight of  A) about 1 N. B) about 10 N. C) about 100 N. D) about 1000 N. E) more than 1000...

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?  A)...

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension  A) increases. B) decreases. C)...

Which has zero acceleration? An object

Which has zero acceleration? An object  A) at rest. B) moving at constant velocity. C) in mechanical equilibrium. D) all of these E) none of...

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

An apple weighs 1 N. When held at rest above your head, the net force on the apple is  A) 0 N. B) 0.1 N. C) 1 N. D) 9.8 N. E) none of these Answer:...

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force...

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

If an object's mass is decreasing while a constant force is applied to the object, the acceleration  A) decreases. B) increases. C) remains...

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is  A) the same as the force on the 1-kg book. B)...

A force is a vector quantity because it has both

A force is a vector quantity because it has both  A) magnitude and direction. B) mass and acceleration. C) action and reaction counterparts. Answer:...

An object's weight may properly be expressed in units of

An object's weight may properly be expressed in units of  A) meters. B) kilograms. C) newtons. D) cubic centimeters. Answer:...

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is  A) one sixth as much. B) the same. C) six times...

Your weight is

Your weight is  A) equal to your mass. B) the gravitational attraction force between you and the Earth. C) a property of mechanical equilibrium. D)...

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same  A) mass. B) volume. C) weight. D) all of these E) none of these Answer:...

A kilogram is a measure of an object's

A kilogram is a measure of an object's  A) weight B) size C) force D) mass Answer:...

Distance is to displacement as

Distance is to displacement as  A) speed is to velocity B) impulse is to momentum C) force is to weight D) velocity is to acceleration E) none...

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting...

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second?

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second?  A)...

When a rock thrown straight upwards gets to the exact top of its path, its

When a rock thrown straight upwards gets to the exact top of its path, its  A) velocity is zero and its acceleration is zero. B) velocity is...

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about  A) 1 second. B) 2 seconds. C)...

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?  A) about 60 m B) about 120 m C) about 180 m D)...

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about  A) 25 m/s. B) 50...

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about  A)...

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about  A) 2 m/s. B) 3 m/s. C) 4 m/s. D) 6...

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding...

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at...

While an object near the Earth's surface is in free fall, its

While an object near the Earth's surface is in free fall, its  A) velocity increases. B) acceleration increases. C) mass increases. D) mass decreases. Answer:...

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is  A) zero. B) 10 km/hr. C) 110 km/hr. D)...

An airplane flies at 100km/h in still air. If it flies into a 10 km/h headwind, its groundspeed is

An airplane flies at 100km/h in still air. If it flies into a 10 km/h headwind, its groundspeed is  A) 100 km/h B) 110 km/h C) 120 km/h D) 90...

Which of the following is not a vector quantity?

Which of the following is not a vector quantity?  A) Speed B) velocity C) acceleration D) all are vector quantities Answer:...

If no external forces are acting on a moving object, it will

If no external forces are acting on a moving object, it will  A) continue moving at the same speed. B) continue moving at the same velocity. C)...

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this...

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to  A) continue to follow...

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why...

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below....