 7.7.1: How much work is done by the gravitational force whena 280kg pile ...
 7.7.2: How high will a 1.85kg rock go if thrown straight upby someone who...
 7.7.3: A 75.0kg firefighter climbs a flight of stairs 20.0 m high.How muc...
 7.7.4: A hammerhead with a mass of 2.0 kg is allowed to fallonto a nail fr...
 7.7.5: Estimate the work you do to mow a lawn 10 m by 20 mwith a 50cm wid...
 7.7.6: A lever such as that shown in Fig. 720 can be usedto lift objects ...
 7.7.7: What is the minimum work needed to push a 950kg car310 m up along ...
 7.7.8: Eight books, each 4.0 cm thick with mass 1.8 kg, lie flaton a table...
 7.7.9: A box of mass 6.0 kg is accelerated from rest by a forceacross a fl...
 7.7.10: (a) What magnitude force is required to give ahelicopter of mass M ...
 7.7.11: A 380kg piano slides 3.9 m down a 27 incline and iskept from accel...
 7.7.12: A gondola can carry 20 skiers, with a total mass of up to2250 kg. T...
 7.7.13: A 17,000kg jet takes off from an aircraft carrier via a catapult(F...
 7.7.14: A 2200N crate rests on the floor. How much work isrequired to move...
 7.7.15: A grocery cart with mass of 16 kg is being pushed atconstant speed ...
 7.7.16: What is the dot product of A = 2.0x2i 4.0jcj + 5.0kand B = 11.Oi + ...
 7.7.17: For any vector V = Vx i + Vy\ + Vz k show thatVx = i V, Vy = j V, y...
 7.7.18: (I) Calculate the angle between the vectors:A = 6.8i  3.4j  6.2k ...
 7.7.19: Show that A (B ) = A B.
 7.7.20: Vector Vi points along the z axis and has magnitudeV\ = 75. Vector ...
 7.7.21: Given the vector A = 3.0i + 1.5j, find a vector B thatis perpendicu...
 7.7.22: A constant force F = (2.0i + 4.0j) N acts on an objectas it moves a...
 7.7.23: If A = 9.0i  8.5j, B = 8.01 + 7.1j + 4.2k, andC = 6.8i  9.2j, det...
 7.7.24: Prove that A B = A XBX + A y By + A ZBZ, startingfrom Eq. 72 and u...
 7.7.25: Given vectors A = 4.8i + 6.8j and B = 9.6i + 6.7j,determine the ve...
 7.7.26: Show that if two nonparallel vectors have the samemagnitude, their ...
 7.7.27: Let V = 20.0i + 22.0j  14.0k. What angles does thisvector make wit...
 7.7.28: Use the scalar product to prove the law o f cosines for atriangle:c...
 7.7.29: Vectors A and B are in the xy plane and their scalarproduct is 20.0...
 7.7.30: A and B are two vectors in the xy plane that makeangles a and /3 wi...
 7.7.31: Suppose A = l.Oi + l.Oj  2.0k and B =l.Oi + l.Oj + 2.0k, (a) what...
 7.7.32: Find a vector of unit length in the xy plane that isperpendicular t...
 7.7.33: (B + C) = A B + A C. [Hint: Use a diagram showingall three vectors ...
 7.7.34: In pedaling a bicycle uphill, a cyclist exerts a downwardforce of 4...
 7.7.35: A spring has k = 65N/m. Draw a graph like that inFig. 711 and use ...
 7.7.36: If the hill in Example 72 (Fig. 74) was not an evenslope but rath...
 7.7.37: The net force exerted on a particle acts in the positivex direction...
 7.7.38: If it requires 5.0 J of work to stretch a particular springby 2.0 c...
 7.7.39: In Fig. 79 assume the distance axis is the x axis andthat a = 10.0...
 7.7.40: The force on a particle, acting along the x axis, varies asshown in...
 7.7.41: A child is pulling a wagon down the sidewalk. For 9.0 mthe wagon st...
 7.7.42: The resistance of a packing material to a sharp objectpenetrating i...
 7.7.43: The force needed to hold a particular springcompressed an amount x ...
 7.7.44: At the top of a pole vault, an athlete actually can dowork pushing ...
 7.7.45: Consider a force F\ = A /^ /x which acts on an objectduring its jou...
 7.7.46: Assume that a force acting on an object is givenby F = axi + by\, w...
 7.7.47: An object, moving along the circumference of a circlewith radius R,...
 7.7.48: A 2800kg space vehicle, initially at rest, falls verticallyfrom a ...
 7.7.49: A 3.0mlong steel chain is stretched out along the toplevel of a h...
 7.7.50: At room temperature, an oxygen molecule, with mass of5.31 X 10_26kg...
 7.7.51: (a) If the kinetic energy of a particle is tripled, by whatfactor h...
 7.7.52: How much work is required to stop an electron(m = 9.11 X 1031 kg) ...
 7.7.53: How much work must be done to stop a 1300kg cartraveling at 95 km/h?
 7.7.54: Spiderman uses his spider webs to save a runawaytrain, Fig. 727. H...
 7.7.55: A baseball (m = 145 g) traveling 32 m/s moves afielders glove backw...
 7.7.56: An 85g arrow is fired from a bow whose string exertsan average for...
 7.7.57: A mass m is attached to a spring which is held stretched adistance ...
 7.7.58: If the speed of a car is increased by 50%, by what factorwill its m...
 7.7.59: A 1200kg car rolling on a horizontal surface has speedv = 66 km/h ...
 7.7.60: One car has twice the mass of a second car, but onlyhalf as much ki...
 7.7.61: A 4.5kg object moving in two dimensions initially has avelocity vi...
 7.7.62: A 265kg load is lifted 23.0 m vertically with an accelerationa = 0...
 7.7.63: (a) How much work is done by the horizontal forceFp = 150 N on the ...
 7.7.64: Repeat assuming a coefficient of friction= 0.10.
 7.7.65: At an accident scene on a level road, investigatorsmeasure a cars s...
 7.7.66: A 46.0kg crate, starting from rest, is pulled across afloor with a...
 7.7.67: A train is moving along a track with constant speedrelative to the ...
 7.7.68: We usually neglect the mass of a spring if it is smallcompared to t...
 7.7.69: An elevator cable breaks when a 925kg elevatoris 22.5 m above the ...
 7.7.70: A 3.0g locust reaches a speed of 3.0 m/s during its jump.What is i...
 7.7.71: In a certain library the first shelf is 12.0 cm off the ground,and ...
 7.7.72: A 75kg meteorite buries itself 5.0 m into soft mud. Theforce betwe...
 7.7.73: A 6.10kg block is pushed 9.25 m up a smooth 37.0 inclinedplane by ...
 7.7.74: The arrangement of atoms in zinc is an example of hexagonalclosepa...
 7.7.75: Two forces, Fj = (l.50i  0.80j + 0.70k) N and F2 =(0.70i + 1.20j) ...
 7.7.76: The barrels of the 16in. guns (bore diameter = 16 in. =41 cm) on t...
 7.7.77: A varying force is given by F = Ae~kx, where x is the position;A an...
 7.7.78: The force required to compress an imperfect horizontalspring an amo...
 7.7.79: A force F = (lO.Oi + 9.0j + 12.0k) kN acts on a smallobject of mass...
 7.7.80: In the game of paintball, players use guns powered bypressurized ga...
 7.7.81: A softball having a mass of 0.25 kg is pitched horizontally at110 k...
 7.7.82: An airplane pilot fell 370 m after jumping from an aircraftwithout ...
 7.7.83: Many cars have 5 mi/h (8 km/h) bumpers that are designedto compress...
 7.7.84: What should be the spring constant A: of a spring designed tobring ...
 7.7.85: Assume a cyclist of weight mg can exert a force on thepedals equal ...
 7.7.86: A simple pendulum consists of a small object of mass m (thebob) sus...
 7.7.87: A car passenger buckles himself in with a seat belt andholds his 18...
 7.7.88: As an object moves along the x axis from x = 0.0 mto x = 20.0 m it ...
 7.7.89: A cyclist starts from rest and coasts down a 4.0 hill.The mass of t...
 7.7.90: Stretchable ropes are used to safely arrest the fall ofrock climber...
 7.7.91: A small mass m hangs at rest from a vertical rope oflength that is ...
 7.7.92: The net force along the linear path of a particle ofmass 480 g has ...
 7.7.93: When different masses are suspended from a spring,the spring stretc...
Solutions for Chapter 7: Work and Energy
Full solutions for Physics for Scientists & Engineers with Modern Physics  4th Edition
ISBN: 9780131495081
Solutions for Chapter 7: Work and Energy
Get Full SolutionsThis expansive textbook survival guide covers the following chapters and their solutions. This textbook survival guide was created for the textbook: Physics for Scientists & Engineers with Modern Physics, edition: 4. Physics for Scientists & Engineers with Modern Physics was written by and is associated to the ISBN: 9780131495081. Chapter 7: Work and Energy includes 93 full stepbystep solutions. Since 93 problems in chapter 7: Work and Energy have been answered, more than 48933 students have viewed full stepbystep solutions from this chapter.

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parallel

any symbol
average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

°C
Celsius degree

°F
Fahrenheit degree