Question

Question 1

A group of students is told to use a meter stick to find the width of a physics lab room. They reported 6 independent measurements: 4.402 m, 4.217 m, 4.345 m, 4.925 m, 4.372 m, 4.289 m. How should they report their best estimate? (note: don’t forget to look for outliers and any extra decimal places)

Group of answer choices

W = (4.33 ± 0.03) m

W = (4.325 ± 0.073) m

W = (4.43 ± 0.25) m

W = (4.425 ± 0.104) m

Question 2

A student measures the length and width of a table and writes down the result as L = 1.786 ± 0.004 m; W = 0.925 ± 0.002 m. What is the area of the table? ( note: the area is the product of length and width for a rectangular table; recall quadrature method for uncertaintes)

Group of answer choices

.652 ± 0.006 m^{2}

1.652 ± 0.005 m^{2}

1.65205 ± 0.006 m^{2}

1.65205 ± 0.00514 m^{2}

Question 3

**( Use this experiment to answer next four
questions)**

A group of students performs a tennis ball drop experiment to determine the acceleration of the falling ball. They measure the time and height of the fall and report the data as:

h = 6.25 ± 0.15 m, t = 1.24 ± 0.06 s. They use equation a =
2h/t^{2} to determine average acceleration and uncertainty.
What is the result for the acceleration in terms of unit
m/s^{2}?

Group of answer choices

8.1 ± 0.8 m/s^{2}

8.1 ± 0.1 m/s^{2}

8.13 ± 0.81 m/s^{2}

8.0 ± 0.1 m/s^{2}

Question 4

Acceleration of free-fall near the earth has a known value of
9.8 m/s^{2}. Based on the experiment described in the last
question suppose the group got the acceleration of the falling
tennis ball as 8.2 ± 0.9 m/s^{2}. What can be said about
the result?

Group of answer choices

None of the above explanations make sense.

The result agrees with known value 9.8 within the uncertainty.

The result doesn’t agree with the known value within the uncertainty.

The result is lower. There must be mistake on either height or time measurement.

Question 5

What quantities were most helpful while comparing the acceleration with the known g in the above example?

Group of answer choices

The difference between height and time

How the human error was accounted for

The difference between the two values

The difference between two values compared to uncertainty

Question 6

The uncertainty in the above measurement seems high (0.9/8.2 = 11%). What one suggestion you could give to improve the result

Group of answer choices

Time and height contribute an equal amount to the uncertainty

Measure the time with higher precision as it contributes most to the uncertainty

Measure the height with more precision as it contributes most to the uncertainty

Question 7

The following two open-ended questions will be on almost all post-lab assessments. We will be grading based on your enthusiasm and honesty.

1) Please describe briefly what did you contribute to the group from the knowledge you already had from your major/minor/career? (10 pts)

2) What did you learn from the activities you did today to help you in your major/career? (10 pts)

Answer #1

1) take the mean od all the six measurements ,the value of mean is= (4.402+4.217+4.345+4.925+4.372+4.289)/6 = 4.425

So the option matching with value is the **D
option**

2) percentage error in L = (0.004/1.786)*100=0.22%

Percentage error in W = (0.002/0.925)*100= 0.21%

Total percentage error = 0.43%

Area of rectangle = L*W = 1.786*0.925 = 1.65205

Error in area = 1.65205*043% = 0.007

So the accurate/ approximate ans is **C
option**

**3))**

**On calculating the acceleration = 2h/t*t =
2*6.25/1.24*1.24 = 8.129 = 8.13**

**now error in acc = 8.13 *percentage error in
acceleration**

**percentage error in acc = 2.4+2*4.83=12.06%**

**Error in acc= 8.13*12.06%=0.9**

**so the correct/approximate option is c
option**

**4))))**

**the result is lower,there must be mistake on either
height and time measurements**

Question:
You stand at the bottom of a long ramp (i.e. one used for
wheelchair access) and throw a tennis ball towards the top of the
ramp, as shown in the sketch. Assume that the tennis ball leaves
your hands a height h = 1.800 m from the ground and at a
speed of v0 = 14.00 m/s and an angle of
elevation of 51.03°, as shown in the sketch. Take the origin of a
Cartesian coordinate system on the...

1.
A 2 kg ball drops from a height of 0.5 m to the table.
What will be the kinetic energy of the ball just before it hits the
table? (assume g= 9.8 m/s2)
Group of answer choices
9.8 J
49.0 J
20.1 J
124 J
24.5 J
2.
Convert the velocity of 100 miles per hour into meters
per second using 1 mile = 1600 meter, and 1 hour = 3600
seconds
Group of answer choices
99.9 m/s
44.4...

Experimental data:
Length L0 of the cold rod (measured with a meter stick): 600 +/-
1 mm
Cross-sectional diameter d of the rod (measured with a caliper):
6.1 +/- 0.1 mm
The change in length ∆L after the rod reached its final
temperature: 1.04 +/- 0.01 mm
The initial temperature of the rod (the room temperature): 22
+/- 1 ̊C
The final temperature of the rod shown by the thermometer: 93 +/- 1
̊C
Linear thermal expansion coefficient
calculation:
1)...

Question 9 (1 point)
An airplane starts from rest (vo = 0) and accelerates down a
runway at 2 m/s2 for 23 s until it takes off. Determine the
distance traveled before takeoff.
Your Answer:
Question 9 options:
Answer
Question 10 (1 point)
An airplane starts from rest (vo = 0) and accelerates down a
runway at 4 m/s2 and covers 245 m before it takes off. Determine
the time it takes.
Your Answer:
Question 10 options:
Answer
Question 11...

Hookes review
Flag this Question
Question 1
20 pts
A student pulls a cart across the floor with a force of 62 N. If
the cart travels 65 m, how much work does the cart do on the
student? Please do not include units or the answer will be marked
incorrect.
Flag this Question
Question 2
20 pts
Object A has a mass of m with a speed of v. Object B has a mass of
m and a velocity...

do all five questions
Question 1
20 pts
Ignoring the effects of air resistance, if a ball falls freely
toward the ground, its total mechanical energy
Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
20 pts
A child jumps off a wall from an initial height of 16.4 m and lands
on a trampoline. Before the child springs back up into the air the
trampoline compresses 1.8 meters. The spring constant...

answer all questions
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is 279 meters...

8 through 10 done please!!
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill is...

just do questions 5 through 10
3.13.6
Question 110 pts
A 319 kg motorcycle is parked in a parking garage. If the car has
35,494 J of potential energy, how many meters above ground is the
car? Report your answer to 1 decimal place. Please do not include
units or the answer will be marked incorrect.
Flag this Question
Question 210 pts
A box sitting on the top of a hill has 252 J of potential energy.
If the hill...

12. Through what angle in degrees does a 31 rpm record turn in
0.27 s
13. Starting from rest, the same torque is applied to a solid
sphere and a hollow sphere. Both spheres have the same size and
mass, and both are rotating about their centers. After some time
has elapsed, which sphere will be rotating faster?
answer choices:
a. hollow sphere
b. They will be rotating equally fast
c. solid sphere
14. In movies, it often happens that...

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