Unformatted text preview: Sean T Scully  GSCI121_3_4_SP10
3
Problems from the Whole Course
Sean T Scully  GSCI121_3_4_SP10
3
Problems from the Whole Course
Suppose that a radio signal travels through space at a speed of
3 × 108 m/s. How far does the signal travel after 29 minutes?
Suppose that a radio signal travels through space at a speed of
3 × 108 m/s. How far does the signal travel after 29 minutes?
Tries 0/10 The Physics of Light & Sound
PRACTICE PROBLEMS Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant velocity
Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant velocity GENERAL SCIENCE 121 SUMMER Answer
Part:
1. forConvert
0
Answer
2. for Part:
Convert
0
Tries 0/10 • 522000000000 [495900000000
3.6 meters into cm. ANSWER: 360 cm
548100000000]
• 522000000000 Sig 0 into
[495900000000
67.1 meters  15 kilometers. ANSWER: 0.0671 km
548100000000] 3. car travels atof speed of 68x 123 written in scientiﬁc anotation is: ANSWER: 4.25 x 101
A The result a 0.003456 15
Sig 0  km/h for 2 hours and then
speed of 80 km/h for 1 hour.xWhat was its average speed for
4. The result of 243678 2005 written in scientiﬁc notation is: ANSWER 4.89 x 108
A trip?
thecar travels at a speed of 68 km/h for 2 hours and then a speed of 80
5. What is thefor 1 hour. What was its average speed forfor a car that travels 19 km in 41 minutes?
Tries 0/10 km/h average speed, in units of km/h,
theANSWER: 27.8 km/h
trip?
Answer
Tries 0/10 • 72 Part:
6. forSuppose that a[68.4 signal travels through space at a speed of 3 × 108 m/s. How far does the
radio
Answer
0
75.6]
signal travel • 72 29 minutes? ANSWER: 5.22 x 1011 m
after
for Part:
[68.4
Sig 0  15
Tries 0/10
7. 0 A car travels at 75.6] of 68 km/h for 2 hours and then a speed of 80 km/h for 1 hour. What was
a speed
its average speed for  15
Consider the positionSig 0 theplot below: Click on the porvs. time trip? ANSWER: 72 km/h
Tries 0/10
tion of the plot that shows constant positive
8. Considerposition vs. timevs. time plot velocitythe por the portion of the plot that shows constant
below:
Consider the the position plot below: Click on Circle
p of the plot that shows constant positive velocity
tion ositive velocity Tries 0/10
Tries 0/10
9. Consider the velocity vs. time plot below: Circle the portion of the plot that shows constant
Consider the velocity vs. time plot below: Click on the poreceleration
tiondof the plot that shows constant deceleration Consider the velocity vs. time plot below: Click on the portion of the plot that shows constant deceleration 1_3_4_SP10
Course 3 10. Consider the velocity vs. time plot below: Circle the portion of the plot that shows constant
velocity travels through space at a speed of
Consider the velocity vs. time plot below: Click on the porTries 0/10 the plot that shows constant velocity
the signal travel after 29 minutes?
tion of Tries 0/10
000000
00000000
0000000]
 15
f 68 km/h for 2 hours and then a
r. What was its average speed for  15 Tries 0/10 time plot below: Click on the porconstant positive velocity Summer 1 Practice Problems 11. How long (in seconds) would be required for a car to go from a speed of 15 m/s to a speed of 30
m/s if the acceleration is 5 m/s2? ANSWER: 3 seconds
12. What is the resulting force (in N) when an object of mass 9 kg experiences a constant
acceleration of 83 (in m/s2) ? ANSWER: 747 N
13. What is the weight of a 92 kg person (in N)? ANSWER: 901.6 N
14. Hanging a mass of 3 kg on a certain spring causes its length to increase 0.4 m. What is the spring
constant (in N/m) of the spring? ANSWER: 73.5 N/m
15. Astronauts can jump so high on the Moon because:
A) they weigh less
B) there is no air resistance
C) FOX tells me that was fake
D) they have less mass
16. A car rounds a corner maintaining a constant speed. Which of the following is true?
A) there is a normal force due to the curve
B) there is no force because the speed is constant
C) there are lots of forces acting on the car that make it appear to move a constant speed
D) there is a force because the velocity changes since the direction changes
17. Two equal forces act on two different objects. The ﬁrst force acts on an object that has 10 times
the mass of the other. We can then say that its resultant acceleration is
A) 1/10 times that of the less massive object
B) exactly the same as the less massive object
C) there is not enough information to draw conclusions about the objects’ accelerations
D) 10 times that of the less massive object
18. Using a block and tackle, I lift a 20 kg crate until it is suspended 8 m above the ﬂoor. How much
potential energy will it contain? ANSWER: 1568 J
19. I toss a 0.05 kg ball straight up into the air. When I release it, it has a speed of 9.2 m/s. What
height above the release point in meters will the ball achieve? ANSWER: 4.3 m
9
20. A Sean T Scully  GSCI121_3_4_SP10at 44 m/s. What is its kinetic energy in Joules? ANSWER: 1.36 x
1400 kg car is traveling
Homework #3
6J
10
Consider the situation illustrated below. If the block of
A pendulum on the Earth’s m = 5 kg of length 0.2
21. Consider the situation illustrated below. If the block of mass surface has a bobslides down the incline
mass m = 5 kg slides down
incline
from a height his= 10 m,the the bottom (in height at the What is the (in m/s)?
what is from speed
its a m/s)? m. bottom natural frequency in Hz of this system?
h = 10 m, what
its speed at
Tries 0/10 Answer
for Part:
0 • 1.11408554267107
[1.05838126553752
1.16978981980462]
Sig 0  15 Most grandfather clocks have a pendulum that ticks each second. The clock ticks with each swing meaning that each tick
is 1/2 of its total period. What length of pendulum is required
to produce this periodic motion?
Tries 0/10 Answer
for Part:
0 •1 [0.95
ANSWER: 14 m/s
1.05]
Tries 0/10
Sig
Answer
22. A spring of spring constant k = 44 N/m is compressed 0.1 0m. 15
How much potential energy is it
• 14
for Part:
[13.3 NSWER: 0.22 J
storing in Joules? A
0
14.7]
Sig 0  15
A spring of spring constant k = 44 N/m is compressed
0.1 m. How much potential energy is it storing in Joules? Summer 0/10
Tries
Answer
for Part:
0 2
• 0.22
[0.209
0.231]
Sig 0  15 Practice Problems 23. A massspring system has a frequency of 0.8 Hz. What is the period of the system in seconds?
ANSWER: 1.25 s
24. A massspring system consists of a spring of spring constant k = 90 N/m and a mass attached to
the spring of mass m = 1.9 kg. What is the natural frequency in Hz of this system? ANSWER:
1.1 Hz. Summer 3 Practice Problems ...
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 Summer '08
 Niculescu,M
 Acceleration, Kinetic Energy, Mass, Velocity

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