Physics Work Homework.docx

# Physics Work Homework.docx - Mariah Duran Professor Tsen M...

• Homework Help
• 5

This preview shows page 1 - 2 out of 5 pages.

Mariah Duran Professor Tsen M, W, F 11:50 Physics Work Homework 1.(a) How much work is done to move a 1.80 X 10 3 -kg Chevrolet Tahoe from rest to 35.2 m/s on a level road? s 35.2 m / ¿ ¿ W = KE = 1 2 m v 2 =( 1.80 × 10 3 kg ) ¿ (b) If this takes place over a distance of 251 m, what is the average net force applied to the car? W = F ∆ x 1120000 J = 251 m F= 4460 N 2. A carte sitting on a flatbed truck which is moving at an acceleration of a = 2.78 m/s 2 . Suppose that the crate does not slip as the truck undergoes a displacement, whose magnitude is r = 111 m. Determine the total work done on the crate by all of the forces acting on it. F = ma = 155 kg ( 2.78 m / s 2 ) = 430.9 N W = Fcosθ ∆x = 430.9 N × cos ( 0 ) × 111 m = 47730 J 3. A motorcyclist is trying to leap across a canyon by driving horizontally off the higher side of the canyon at a speed of 78.0 m/s. If air resistance is neglected and the difference in height on two sides of the canyon is 252 m, what is the speed of the motorcycle as it reaches the lower side of the canyon? (There are no conservative forces) mgh + 1 2 mv 2 = mgh + 1 2 m v 2 1 2 ( 78.0 m / s ) 2 + ( 9.80 m / s 2 ) ( 252 m ) = 1 2 ( v 2 ) 3042 m 2 / s 2 + 2469.6 m 2 / s 2 = 1 2 ( v 2 ) v f = 105 m / s (We can only take out the mass in velocity or height problems

Subscribe to view the full document.

You've reached the end of this preview.
• Spring '08
• Cavatto
• Force, Mariah Duran, V f, μk Fsinθ, Professor Tsen

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern