{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Ch4-HW4-solutions - louey(cal2859 CH6-HW1 florin(56930 This...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
louey (cal2859) – Ch4-HW4 – florin – (56930) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of2)10.0points If an object is moving with constant momen- tum vectorp = ( 12 , 12 , 10 ) kg · m / s , what is the magnitude of the rate of change of momentum dvectorp dt ? Correct answer: 0 kg · m / s. Explanation: A constant momentum implies that the rate of change of momentum is zero. 002(part2of2)10.0points What is the magnitude of the net force acting on the object? Correct answer: 0 N. Explanation: By the Momentum Principle, Δ vectorp = vector F net Δ t, if the rate of change of momentum is zero, then the net force is also zero. 003(part1of4)10.0points A ball whose mass is 1 . 3 kg is suspended from a spring whose stiffness is 3 N / m. The ball oscillates up and down with an amplitude of 14 cm. Take g = 9 . 8 m / s 2 . What is the angular frequency ω ? Correct answer: 1 . 51911 rad / s. Explanation: The angular frequency is given by ω = radicalbigg k m = radicalBigg 3 N / m 1 . 3 kg = 1 . 51911 rad / s . 004(part2of4)10.0points What is the frequency? Correct answer: 0 . 241774 s - 1 . Explanation: The frequency is given by f = ω 2 π = 0 . 241774 s - 1 . 005(part3of4)10.0points What is the period? Correct answer: 4 . 1361 s. Explanation: The period is given by T = 1 f = 1 0 . 241774 s - 1 = 4 . 1361 s . 006(part4of4)10.0points 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: 4 . 1361 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 10.0points A mass of 6 kg is connected to a horizon- tal spring whose stiffness is 18 N / m. When the spring is relaxed, x = 0. The spring is stretched so that the initial value of x = 0 . 3 m.
Background image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}