HW #4-4-solutions - pasha (sep635) HW 4-4 Antoniewicz...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: pasha (sep635) HW 4-4 Antoniewicz (56445) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 5.0 points If an object is moving with constant momen- tum ~ p = h 10 ,- 10 ,- 10 i kg m / s , what is the magnitude of the rate of change of momentum d ~ p dt ? Correct answer: 0 kg m / s. Explanation: A constant momentum implies that the rate of change of momentum is zero. 002 (part 2 of 2) 5.0 points What is the magnitude of the net force acting on the object? Correct answer: 0 N. Explanation: By the Momentum Principle, ~ p = ~ F net t, if the rate of change of momentum is zero, then the net force is also zero. 003 (part 1 of 4) 3.0 points A ball whose mass is 1 . 2 kg is suspended from a spring whose sti ff ness is 5 N / m. The ball oscillates up and down with an amplitude of 13 cm. Take g = 9 . 8 m / s 2 . What is the angular frequency ? Correct answer: 2 . 04124 rad / s. Explanation: The angular frequency is given by = r k m = s 5 N / m 1 . 2 kg = 2 . 04124 rad / s . 004 (part 2 of 4) 3.0 points What is the frequency? Correct answer: 0 . 324874 s- 1 . Explanation: The frequency is given by f = 2 = . 324874 s- 1 . 005 (part 3 of 4) 2.0 points What is the period? Correct answer: 3 . 07812 s. Explanation: The period is given by T = 1 f = 1 . 324874 s- 1 = 3 . 07812 s . 006 (part 4 of 4) 2.0 points Suppose this apparatus was taken to the Moon, where the strength of the gravitational field is only 1/6 of that on Earth. What would the period be on the Moon? (Consider care- fully how the period depends on properties of the system; look at the equation.) Correct answer: 3 . 07812 s. Explanation: This period is the same as the period you found in part 3, since g does not enter the formula for T . 007 10.0 points A mass of 5 kg is connected to a horizon- tal spring whose sti ff ness is 19 N / m. When the spring is relaxed, x = 0. The spring is stretched so that the initial value of x = 0 . 2 m. The mass is released from rest at time t = 0. Remember that when the argument of a pasha (sep635) HW 4-4 Antoniewicz (56445) 2 trigonometric function is in radians, on a cal- culator you have to switch the calculator to radians or convert the radians to degrees....
View Full Document

Page1 / 6

HW #4-4-solutions - pasha (sep635) HW 4-4 Antoniewicz...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online