Question

An athlete competing in long jump leaves the ground with a speed of 10.0 m/s at an angle of 45º above the horizontal. What is the horizontal distance of the point where he lands from the point where the leaves the ground?

Select one:

a. 4.8 m

b. 3.4 m

c. 10.2 m

d. 5.1 m

A 8.00 kg box is in contact with a 12.00 kg box on a frictionless surface as shown. The 8.00-kg block is being pushed by a 10.0-N force. What is the magnitude of the force that 12.00-kg mass provides on the 8.00-kg mass?

Select one:

a. 6.00 N

b. 4.00 N

c. 12.0 N

d. 10.0 N

A moon of the planet Jupiter (mass of Jupiter = 1.90 X
10^{27} kg) is at the average distance of 4.22 X
10^{8} m from Jupiter. What is the orbital period of the
moon?

Select one:

a. 1.77 days

b. 1.50 days

c. 1.22 days

d. 2.90 days

The x- and y- components of a force vector are 2.00 N and 4.00 N, respectively. Determine the direction of the force vector with the positive x-axis.

Select one:

a. 72.0º

b. 243º

c. 117º

d. 63.4º

A 1200 kg car rounds a corner of radius r = 45.0 m. If the coefficient of static friction between the tires and the road is 0.600, what is the greatest speed the car can have in the corner without skidding?

Select one:

a. 10.0 m/s

b. 25.4 m/s

c. 16.3 m/s

d. 19.0 m/s

A ball is thrown horizontally with a speed of 10.0 m/s from a height of 49.0 m above the ground. How long does the ball remain in the air before striking the ground?

Select one:

a. 0.64 s

b. 4.43 s

c. 3.16 s

d. 2.96 s

As shown in the figure, a 4.0 kg concrete block rests on a smooth level table (assume no friction). A 6.0 kg mass is attached to the block by a string of negligible mass passed over a light frictionless pulley. Determine the acceleration of the system (in meter per second squared unit) when the masses are released.

Select one:

a. 4.4

b. 3.6

c. 9.8

d. 5.9

Answer #1

Correct option is : **(d) 5.1 m**.

Solution :

A 1.40 kg block slides with a speed of 0.950 m/s on a
frictionless horizontal surface until it encounters a spring with a
force constant of 734 N/m. The block comes to rest after
compressing the spring 4.15 cm. Find the spring potential, U, the
kinetic energy of the block, K, and the total mechanical energy of
the system, E, for compressions of (a) 0 cm, (b) 1.00 cm, (c) 2.00
cm, (d) 3.00 cm, (e) 4.00 cm

A baseball approaching a batter with a speed of 25 m/s is hit
and leaves the bat in the directly opposite direction with a speed
of 50 m/s. The mass of the baseball is 0.15 kg.
a) What is the magnitude of the impulse (in N · s) exerted by
the bat on the baseball?
b) If the time of contact between the bat and the baseball is
2.9 ms, what is the average force exerted by the bat on...

A block of mass m=1.4 kg, moving on frictionless surface with a
speed v1i=5.3 m/s, makes a perfectly elastic collision with a block
of mass M at rest, see the sketch. After the collision, the 1.4 kg
block recoils with a speed of v1f=0.3 m/s. What is the speed of
block M after the collision?
A.
v2f=4.8 m/s
B.
v2f=5.2 m/s
C.
v2f=3.4 m/s
D.
v2f=5.0 m/s

A ball leaves the ground at the speed of 37 m/s and at the angle
53.1 degrees .
a/ Find the maximun and the minimum speed of the ball after
leaving the ground. Explain.
b/ Find the time when the ball reaches the hight of 50 m.
Justify your answer.

Block A of mass (mA) = 9.0 kg with an initial speed
(uA) = 2.1 m/s collides with a Block B of mass
(mB) = 27 kg which had an in initial speed
(uB) = 0.50 m/s, as shown int the figure. The surface is
frictionless, and the blocks suddenly collide and couple. After the
collision, Find the common speed (Vf) that the blocks
travel with.
a) 0.5 m/s
b) 0.9 m/s
c) 0.1 m/s
d) 0.6 m/s

A bullet of mass 4 g moving with an initial speed 400 m/s is
fired into and passes through a block of mass 5 kg, as shown in the
figure. The block, initially at rest on a frictionless, horizontal
surface, is connected to a spring of force constant 538 N/m. If the
block moves a distance 1.3 cm to the right after the bullet passed
through it, find the speed v at which the bullet emerges from the
block and...

A block moving with speed vo = 10 m/s and mass m1 = 6 kg
collides with a block of mass m2 = 5 kg initially at rest. (Both
slide on a frictionless surface at all times.) Now the two blocks
collide with a third block initially at rest. What is the final
momentum of the system?
Question options:
A) 30 kg-m/s B) 60 kg-m/s C) 190 kg-m/s D) 250 kg-m/s E) 310
kg-m/s

A racing driver negotiates a corner of radius 20 m at a speed of
8.5 m/s on level ground without slipping. The mass of the car is
600 kg and that of the driver is 91 kg.
a. Calculate the total frictional force acting on the wheels as
the corner is made.
b. After this, the driver then negotiates a corner, which is
banked at 30 degrees to the horizontal. The radius of this circular
path is also 20 m....

A track athlete performs a standing long jump (m = 81 kg). The
maximum average ground reaction force they can generate is 1000 N
for 0.3 seconds. If their shoes have a coefficient of friction of
0.75, what is the maximum horizontal distance they can jump?

A stone is kicked so that it leaves the ground with an initial
velocity of 10.0 m/s at an angle of 37.0deg. The stone is kicked
toward a loading dock whose near edge is 3.00m away and 1.00m
high.
a.) What are the components of the stone's initial velocity? (I
have 7.99m/s (horizontal) + 6.02m/s (vertical))
b.) How high does it go? (I have 1.85 m)
c.) How far from the edge does it strike the dock?
d.) How fast...

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