Question

Maya and Alejandro are getting ready to play ball on a cart with frictionless wheels. The cart is at rest. The total mass of Maya, Alejandro, and the cart combined is 145 kg. At precisely the same time, they each throw a ball to the other. Maya throws a 0.60 kg ball at 1.5 m/s leftward towards Alejandro. Simultaneously, Alejandro throws a 1.2 kg ball at 5.0 m/s towards the right to Maya. (These velocities and directions are as observed and measured by Karina who is standing stationary on the ground next to them, while trying not to get hit by any flying balls.)

a. While both balls are in the air, Karina measures the speed and direction of the cart and riders. What are her results?

b. Karina again measures the velocity (speed and direction) of the cart and riders after they have caught the balls. Now what does Karina measure?

Answer #1

John and Kevin play catch with a
tennis ball while standing on skateboards. Initially John is moving
to the right at 6.50 m/s and Kevin is moving to the left at 4.00
m/s. John’s mass is 63.0 kg, Kevin’s mass is 70.0 kg, and the mass
of the tennis ball is 7.50 kg. John starts out with the tennis
ball, and throws it towards Kevin. The tennis ball moves towards
Kevin with ground speed 12.0 m/s.
(a) What is John’s...

A billiard ball that weighs about 0.50 kg slides without rolling
along a frictionless surface at a velocity of 3.5 m/s. It hits a
stationary billiard ball of the same mass. After the collision, the
first ball is redirected 45 degrees to the west side of its initial
direction, while the second ball is redirected 45 degrees to the
east side of the first ball’s initial direction. Both balls have
the same speed after the collision, and both slide without...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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