Question

1. A 25 kg skydiver has a speed of 20 m/s at an altitude of 350 m above the ground. Determine the kinetic energy possessed by the skydiver.

2. If a cruise ship travels 150 km to the south and then 250 km to
the west, what is the ship’s displacement from its starting
point?

3. A train is accelerating at a rate of 5 m/s . If its initial
velocity is 15 m/s, what is its speed after 10

seconds?

4. A bowling ball weighs 49 N. What is its mass?

5. A force gives a 300 kg mass an acceleration of 3 m/s . What
would be the acceleration if the same

force would give a mass of 200 kg?

6. What is the time needed for a car whose speed is 20 m/s to
travel a distance of 100 m?

7. If 4900 joules of work is used to lift a 100 kg crate to a high
shelf in a warehouse, how high was the crate lifted?

8. A tractor pulls a felled tree along the ground for a distance of
50 m. If the tractor exerts a force of 400 N, how much work will be
done?

9. A bodybuilder lifted a barbell 5 m above the ground? If the
barbell weighs 200 N, how much potential energy is gained holding
the barbell in the air?

10. Rudy ran up the stairs, elevating his 50 kg body a vertical
distance of 5 meters in a time of 4 seconds at a constant
speed.

a) Determine the work done by Rudy in climbing the staircase.

b) Determine the power generated by Rudy.

Part II

1. A boat at anchor is rocked by waves whose crests are 10 m apart
and whose speed is 20 m/s. How long does it take these waves to
reach the boat?

2. A boat at anchor is rocked by waves whose crests are 20 m apart
and whose speed is 4 m/s. At what frequency do these waves reach
the boat?

3. Find the wavelength of a wave with a period of 10 s and a
velocity of 30 m/s.

4. Waves in the open sea whose wavelength is 50 m and whose velocity is 35 m/s. What is the period of the waves?

5. Waves in the ocean have a period 20 s and a wavelength of 100 m. Find their velocity

Answer #1

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A skydiver is at an altitude of 1,525 m. After 11.0 seconds of
free fall, he opens his parachute and finds that the air
resistance, FD, is given by the formula
FD = −bv, where b is a
constant and v is the velocity. If b = 100,and
the mass of the skydiver is 86.0 kg, first set up differential
equations for the velocity and the position, and then find the
following. (Assume air resistance is negligible prior to the...

1. A 5 kg mass is initially traveling forwards at 10 m/s. It
collides with a wall and rebounds with a speed of 5 m/s. What is
the magnitude of the object's change in momentum?
a) 5 kg m/s
b) 25 kg m/s
c) 50 kg m/s
d) 75 kg m/s
2. Compare punching a wall to punching a bed. It takes more time
for your hand to come to rest when punching a bed than when
punching a wall....

1) A 68 kg skydiver falls at a contast terminal speed of 59m/s.
at what rate is gravitational potential energy being removed from
the earth-skydiver system in kw?
2) A 2.0 kg block is dropped from a height of 40cm onto a spring
of force constant k= 1960 n/m. what is the max displacement of the
spring in cm?

A skydiver of mass 84.0 kg jumps from a slow-moving aircraft and
reaches a terminal speed of 52.6 m/s.
(a) What is her acceleration when her speed is 30.0 m/s?
magnitude
m/s2
direction
(b) What is the drag force on the skydiver when her speed is 52.6
m/s?
magnitude
N
direction
(c) What is the drag force on the skydiver when her speed is 30.0
m/s?
magnitude
N
direction

1.)
Steve pushes a crate 20 m across a level floor at a constant speed
with a force of 200 N. The velocity of the crate is in the
direction of the force Steve is applying to the crate. How much
work is done by Steve?
2.) Steve pushes a crate 20 m across a level floor at a
constant speed with a force of 200 N. The velocity of the crate is
in the direction of the force Steve...

To measure her speed, a skydiver carries a buzzer emitting a
steady tone at 1 800 Hz. A friend on the ground at the landing site
directly below listens to the amplified sound he receives. Assume
the air is calm and the speed of sound is independent of altitude.
While the skydiver is falling at terminal speed, her friend on the
ground receives waves of frequency 2 260 Hz. (Use 343 m/s as the
speed of sound.)
(a) What is...

To measure her speed, a skydiver carries a buzzer emitting a
steady tone at 1 800 Hz. A friend on the ground at the landing site
directly below listens to the amplified sound he receives. Assume
the air is calm and the speed of sound is independent of altitude.
While the skydiver is falling at terminal speed, her friend on the
ground receives waves of frequency 2 216 Hz. (Use 343 m/s as the
speed of sound.)
(a) What is...

A skydiver with mass m = 50.0 kg has reached a terminal velocity
of 20.0 m/s. The skydiver's drag coefficient is:

Consider a skydiver of mass 75 kg who jumps from an airplane
flying at an altitude of 1,900 m. With her parachute open, her
terminal velocity is 8.1 m/s.
(a) What is the work done by gravity?
J
(b) What is the average force of air drag during the course of her
jump? (Enter the magnitude of the force.)
N

A skydiver of mass 92 kg jumps from a slow-moving airplane and
reaches a terminal speed of 49.9 m/s before opening her
parachute.
(a) What was her acceleration when her speed was 36.9 m/s?
(b) What was the magnitude of the drag force at the same
time?

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