6. Two football players run towards each other and collide on a slick, muddy field. Assuming...
6. Two football players run towards each other and collide on a slick, muddy field. Assuming that player A has mass of 85 kg and speed of 7 m/s and player B has mass of 75 kg and speed of 7.5 m/s, what happens right after they collide (and stick together)?
8. A red cart collides with a blue cart on a rough surface. Which forces acting on the blue cart are internal, if the system is red cart + blue cart?
17. A weight of 10 N is located 30 cm to the left of the fulcrum of a balance beam. At what distance from the fulcrum should a 15 N weight be placed to balance the beam?
22. A car and a truck move at the same speed, but the truck has twice as much mass as the car. Which has a bigger kinetic energy?
25. A person pushes on a 5 kg block with a force of 80 N, while 10 N of friction acts on the block. If it travels 3 m, what total work is done on the block?
Homework Answers
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6. Two football players run towards each other and collide on a
slick, muddy field. Assuming...
Two football players collide head-on in midair while chasing a pass. The first player has a...
Two football players collide head-on in midair while chasing a pass. The first player has a 110 kg mass and an initial velocity of 4.10 m/s in the positive x direction, while the second player has a 125 kg mass and initial velocity of 3.40 m/s in the negative x direction. What is the x component of their velocity just after impact if they cling together? (Indicate the direction with the sign of your answer.)
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other....
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s. The carts stick together when they collide. Calculate their final speed. 1 m/s 0.5 m/s 0.33 m/s 0.67 m/s
Two toy trucks, travelling towards each other, collide. Just before the collision, the 1st truck of...
Two toy trucks, travelling towards each other, collide. Just before the collision, the 1st truck of mass m1= 2 kg travelled to the right with speed 5 m/s, and 2nd truck of mass m2=8 kg travelled to the left with speed 5 m/s. Right after the collision, the 1st truck bounces back with speed 18 m/s. What is the final speed of the 2nd truck?
6. A 50-kg front seat passenger in a car moving initially with a speed of 25...
6. A 50-kg front seat passenger in a car moving initially with a speed of 25 m/sisbr rest by an air bag in a time of 0.4 s a) What is the impulse acting on the passenger? b) What is the average force acting on the passenger in this process?? 7. A ball traveling with an initial momentum of 5.0 kg.m/s bounces off a wall and comes back in the opposite direction with a momentum of -4.5 kg.m/s a) What...
15. Two automobiles traveling at right angles to each other collide and stick together. Car A...
15. Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1000 kg and had a speed of 25 m/s before the collision. Car B has a mass of 1500 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision, assuming that...
p mv 6. A 0.5 kg blue dynamics cart is moving with an initial velocity of...
p mv 6. A 0.5 kg blue dynamics cart is moving with an initial velocity of -2 m/s when it collides with a 0.25 kg red dynamics cart. The red cart is initially moving with a velocity of +4 m/s. As a result of the collision, the blue dynamics cart has a final velocity of +0.8 m/s. What is the final velocity of the red cart? 7. Starting from rest, a 1600 kg car is subject to a net force...
#4-7 Two ice skaters stand facing each other at rest on a frozen pond. They push...
#4-7
Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48 kg skater acquires a speed of 0.69 m/s If the other skater acquires a speed of 0.81 m/s, what is her mass in kilograms? kg My Notes Ask Your Teacher -/2 points HAFColPhys1 8.2WA019. O5 Submissiens Used A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a...
Linear Momentum of an object is conserved At all times b. Only when the net external...
Linear Momentum of an object is conserved At all times b. Only when the net external force on the object is Zero When the net external torque on the object is Zero d. Never A truck of mass 4000 (kg) is moving at 10 (m/s). A car of mass 1000 (kg) is moving at 40 (m/s). So, the truck’s momentum, compared to the car, is Greater b. Smaller c. the same d. Cannot say without knowing their accelerations A 1000...
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other. The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s. The carts stick together when they collide. Calculate their final speed. 1 m/s 0.5 m/s 0.33 m/s 0.67 m/s
6. A 50-kg front seat passenger in a car moving initially with a speed of 25 m/sisbr rest by an air bag in a time of 0.4 s a) What is the impulse acting on the passenger? b) What is the average force acting on the passenger in this process?? 7. A ball traveling with an initial momentum of 5.0 kg.m/s bounces off a wall and comes back in the opposite direction with a momentum of -4.5 kg.m/s a) What...
15. Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1000 kg and had a speed of 25 m/s before the collision. Car B has a mass of 1500 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision, assuming that...
p mv 6. A 0.5 kg blue dynamics cart is moving with an initial velocity of -2 m/s when it collides with a 0.25 kg red dynamics cart. The red cart is initially moving with a velocity of +4 m/s. As a result of the collision, the blue dynamics cart has a final velocity of +0.8 m/s. What is the final velocity of the red cart? 7. Starting from rest, a 1600 kg car is subject to a net force...
#4-7
Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48 kg skater acquires a speed of 0.69 m/s If the other skater acquires a speed of 0.81 m/s, what is her mass in kilograms? kg My Notes Ask Your Teacher -/2 points HAFColPhys1 8.2WA019. O5 Submissiens Used A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a...
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