6.7 Two blocks are con- Figure E6.7 nected by a very lght string passing over a massiess and nctoniess puliey (Fg. ./). 00 the 20.0-N block moves 75.0 cm to the right and the 12.0-N block moves 75.0 cm down- ward. How much work is done (a) on the 12.0-N block by () gravity and (i) the tension in the string? (b) How much work is done on the 20.0-N blockby normal ocer c) Find me totar wok done on cach oiock, 6.20 of 6.20 an 18.0-m-tall A 4.80-Kg Wilerero rppeu Test rom the room (a) Calculate the work done by uravitv n the wrl its displacement from the roof to the ground. (h) Just before strikes the ground, what is the watermelon's () kinctic energy and (i) speed? (C) Which of the answers in parts (a) and (b) would be different if there were appreciable air resistance? 740 7.40 A 2.00-kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a trictionless, hori- Ontal surlace and then up a Irictionless incne wilh slope 37.0 (Fig. P7.40). (a) What is the speed of the block as it slides along the horizontal surface after having left the spring? (6) How fat does the block travel up the incline before starting to slide back down? igure P.a0 k= 400 N/m 2.00 kg w.H 37.0 0220 m 7.60 7.60 CP A sled with rider having a combined mass of 125 kg travels over a perfectly smooth icy hill (Fig. P7.60). How lar does the sled land from the foot of the clifr? 6.7 · Two blocks are con- Figure E6.7nected by a very light stringpassing over a massless andfrictionless pulley (Fig. E6.7).Traveling at constant speed,20.0the 20.0-N block moves 75.0 cmto the right and the 12.0-Nblock moves 75.0 cm down-ward. How much work is done(a) on the 12.0-N block by (i) gravity and (ii) the tension in thestring? (b) How much work is done on the 20.0-N block by(i) gravity, (ii) the tension in the string, (iii) friction, and (iv) thenormal force? (c) Find the total work done on cach block.6.206.20 · A 4.80-kg watermelon is dropped from rest from the roofof an 18.0-m-tall building and feels no appreciable air resistance.(a) Calculate the work done by gravity on the watermelon duringits displacement from the roof to the ground. (b) Just before itstrikes the ground, what is the watermelon's (i) kinctic energy and(ii) speed? (c) Which of the answers in parts (a) and (b) would bedifferent if there were appreciable air resistance?7.407.40 · A 2.00-kg block is pushed against a spring with negligiblemass and force constant k = 400 N/m, compressing it 0.220 m.When the block is released, it moves along a frictionless, hori-zontal surface and then up a frictionless incline with slope 37.0°(Fig. P7.40). (a) What is the speed of the block as it slides alongthe horizontal surface after having left the spring? (b) How fardoes the block travel up the incline before starting to slide backdown?Figure P7.40k = 400 N/m m = 2.00 kgww37.0-0.20 mH7.607.60 * CP A sled with rider having a combined mass of 125 kgtravels over a perfectly smooth icy hill (Fig. P7.60). How far doesthe sled land from the foot of the cliff?SAFigure P7.6011.0 m Cliff22.5 m/s

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College Physics

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ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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6.7 Two blocks are con- Figure E6.7 nected by a very lght string passing over a massiess and nctoniess puliey (Fg. ./). 00 the 20.0-N block moves 75.0 cm to the right and the 12.0-N block moves 75.0 cm down- ward. How much work is done (a) on the 12.0-N block by () gravity and (i) the tension in the string? (b) How much work is done on the 20.0-N blockby normal ocer c) Find me totar wok done on cach oiock, 6.20 of 6.20 an 18.0-m-tall A 4.80-Kg Wilerero rppeu Test rom the room (a) Calculate the work done by uravitv n the wrl its displacement from the roof to the ground. (h) Just before strikes the ground, what is the watermelon's () kinctic energy and (i) speed? (C) Which of the answers in parts (a) and (b) would be different if there were appreciable air resistance? 740 7.40 A 2.00-kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a trictionless, hori- Ontal surlace and then up a Irictionless incne wilh slope 37.0 (Fig. P7.40). (a) What is the speed of the block as it slides along the horizontal surface after having left the spring? (6) How fat does the block travel up the incline before starting to slide back down? igure P.a0 k= 400 N/m 2.00 kg w.H 37.0 0220 m 7.60 7.60 CP A sled with rider having a combined mass of 125 kg travels over a perfectly smooth icy hill (Fig. P7.60). How lar does the sled land from the foot of the clifr?

6.7 · Two blocks are con- Figure E6.7
nected by a very light string
passing over a massless and
frictionless pulley (Fig. E6.7).
Traveling at constant speed,
20.0
the 20.0-N block moves 75.0 cm
to the right and the 12.0-N
block moves 75.0 cm down-
ward. How much work is done
(a) on the 12.0-N block by (i) gravity and (ii) the tension in the
string? (b) How much work is done on the 20.0-N block by
(i) gravity, (ii) the tension in the string, (iii) friction, and (iv) the
normal force? (c) Find the total work done on cach block.
6.20
6.20 · A 4.80-kg watermelon is dropped from rest from the roof
of an 18.0-m-tall building and feels no appreciable air resistance.
(a) Calculate the work done by gravity on the watermelon during
its displacement from the roof to the ground. (b) Just before it
strikes the ground, what is the watermelon's (i) kinctic energy and
(ii) speed? (c) Which of the answers in parts (a) and (b) would be
different if there were appreciable air resistance?
7.40
7.40 · A 2.00-kg block is pushed against a spring with negligible
mass and force constant k = 400 N/m, compressing it 0.220 m.
When the block is released, it moves along a frictionless, hori-
zontal surface and then up a frictionless incline with slope 37.0°
(Fig. P7.40). (a) What is the speed of the block as it slides along
the horizontal surface after having left the spring? (b) How far
does the block travel up the incline before starting to slide back
down?
Figure P7.40
k = 400 N/m m = 2.00 kg
ww
37.0
-0.20 mH
7.60
7.60 * CP A sled with rider having a combined mass of 125 kg
travels over a perfectly smooth icy hill (Fig. P7.60). How far does
the sled land from the foot of the cliff?
SA
Figure P7.60
11.0 m Cliff
22.5 m/s

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