Relative mass, gravitational force, and tension
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1. An astronaut orbits the earth in a space capsule whose height above the earth is equal to the earth's radius. How does the mass of the astronaut in the capsule compare to her mass on the earth?
A It is equal to her mass on earth.
B It is equal to one-half of her mass on earth.
C It is equal to one-third of her mass on earth.
D It is one-fourth her mass on earth.
E It is equal to one-sixteenth her mass on earth.
2. What is the magnitude of the gravitational force acting on a 79.5-kg student due to a 60.0-kg student sitting 2.25 m away in the lecture hall?
A 3.14 x 10-9 N
B 2.82 x 10-8 N
C 7.91 x 10-10 N
D 1.41 x 10-7 N
E 6.29 x 10-8 N
3. A rock is suspended from a string; and it accelerates downward. Which one of the following statements concerning the tension in the string is true?
A The tension points downward.
B The tension is less than the weight of the rock.
C The tension is equal to the weight of the rock.
D The tension is greater than the weight of the rock.
E The tension is independent of the magnitude of the rock's acceleration.
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Solution Summary
This post involves solving questions for relative mass, gravitational force, and tension.
Education
- BSc , Wuhan Univ. China
- MA, Shandong Univ.
Recent Feedback
- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"
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