Problem Q2.1DQ: Does the speedometer of a car measure speed or velocity? Explain. Problem Q2.2DQ: The black dots at the top of Fig. Q2.2 represent a series of high-speed photographs of an insect... Problem Q2.3DQ: Can an object with constant acceleration reverse its direction of travel? Can it reverse its... Problem Q2.4DQ: Under what conditions is average velocity equal to instantaneous velocity? Problem Q2.5DQ: Is it possible for an object to be (a) slowing down while its acceleration is increasing in... Problem Q2.6DQ: Under what conditions does the magnitude of the average velocity equal the average speed? Problem Q2.7DQ: When a Dodge Viper is at Elwoods Car Wash, a BMW Z3 is at Elm and Main. Later, when the Dodge... Problem Q2.8DQ: A driver in Massachusetts was sent to traffic court for speeding. The evidence against the driver... Problem Q2.9DQ: Can you have zero displacement and nonzero average velocity? Zero displacement and nonzero velocity?... Problem Q2.10DQ: Can you have zero acceleration and nonzero velocity? Use a xt graph to explain. Problem Q2.11DQ: Can you have zero velocity and nonzero average acceleration? Zero velocity and nonzero acceleration?... Problem Q2.12DQ: An automobile is traveling west. Can it have a velocity toward the west and at the same time have an... Problem Q2.13DQ: The officials truck in Fig. 2.2 is at x1 = 277 m at t1 = 16.0 s and is at x2 = 19 m at t2 = 25.0 s.... Problem Q2.14DQ: Under constant acceleration the average velocity of a particle is half the sum of its initial and... Problem Q2.15DQ: You throw a baseball straight up in the air so that it rises to a maximum height much greater than... Problem Q2.16DQ: Prove these statements: (a) As long as you can ignore the effects of the air, if you throw anything... Problem Q2.17DQ: A dripping water faucet steadily releases drops 1.0 s apart. As these drops fall, does the distance... Problem Q2.18DQ: If you know the initial position and initial velocity of a vehicle and have a record of the... Problem Q2.19DQ: From the top of a tall building, you throw one ball straight up with speed 0 and one bal1 straight... Problem Q2.20DQ: You run due cast at a constant speed of 3.00 m/s for a distance of 120.0 m and then continue running... Problem Q2.21DQ: An object is thrown straight up into the air and feels no air resistance. How can the object have an... Problem Q2.22DQ: When you drop an object from a certain height, it takes time T to reach the ground with no air... Problem 2.1E: A car travels in the +x-direction on a straight and level road. For the first 4.00 s of its motion,... Problem 2.2E: In an experiment, a shearwater (a seabird) was taken from its nest, flown 5150 km away, and... Problem 2.3E: Trip Home. You normally drive on the freeway between San Diego and Los Angeles at an average speed... Problem 2.4E: From Pillar to Post. Starting from a pillar, you run 200 m cast (the +x-direction) at an average... Problem 2.5E: Starting from the front door of a ranch house, you walk 60.0 m due east to a windmill, turn around,... Problem 2.6E: A Honda Civic travels in a straight line along a road. The cars distance x from a stop sign is given... Problem 2.7E: CALC A car is stopped at a traffic light. It then travels along a straight road such that its... Problem 2.8E: CALC A bird is flying due east. Its distance from a tall building is given by x(t) = 28.0 m + (12.4... Problem 2.9E: A ball moves in a straight line (the x-axis). The graph in Fig. E2.9 shows this balls velocity as a... Problem 2.10E: A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min it... Problem 2.11E: A test car travels in a straight line along the x-axis. The graph in Fig. E2.11 shows the cars... Problem 2.12E: Figure E2.12 shows the velocity of a solar-powered car as a function of time. The driver accelerates... Problem 2.13E: The Fastest (and Most Expensive) Car! The table shows test data for the Bugatti Veyron Super Sport,... Problem 2.14E: CALC A race car starts from rest and travels east along a straight and level track. For the first... Problem 2.15E: CALC A turtle crawls along a straight line, which we will call the x-axis with the positive... Problem 2.16E: An astronaut has left the International Space Station to test a new space scooter. Her partner... Problem 2.17E: CALC A cars velocity as a function of time is given by x(t) = + t2, where = 3.00m/s and = 0.100... Problem 2.18E: CALC The position of the front bumper of a test car under microprocessor control is given by x(t) =... Problem 2.19E: An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in... Problem 2.20E: BIO Blackout? A jet fighter pilot wishes to accelerate from rest at a constant acceleration of 5g to... Problem 2.21E: A Fast Pitch. The fastest measured pitched baseball left the pitchers hand at a speed of 45.0 m/s.... Problem 2.22E: A Tennis Serve. In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s. A... Problem 2.23E: BIO Automobile Air Bags. The human body can survive an acceleration trauma incident (sudden stop) if... Problem 2.24E: BIO A pilot who accelerates at more than 4g begins to gray out but doesnt completely lose... Problem 2.25E: BIO Air-Bag Injuries. During an auto accident, the vehicles air bags deploy and slow down the... Problem 2.26E: BIO Prevention of Hip Fractures. Falls resulting in hip fractures are a major cause of injury and... Problem 2.27E: BIO Are We Martians? It has been suggested, and not facetiously, that life might have originated on... Problem 2.28E: Entering the Freeway. A car sits on an entrance ramp to a freeway, waiting for a break in the... Problem 2.29E: At launch a rocket ship weighs 4.5 million pounds. When it is launched from rest, it takes 8.00 s to... Problem 2.30E: A cat walks in a straight line, which we shall call the x-axis, with the positive direction to the... Problem 2.31E: The graph in Fig. E2.31 shows the velocity of a motorcycle police officer plotted as a function of... Problem 2.32E: Two cars, A and B, move along the x-axis. Figure F.2.32 is a graph of the positions of A and B... Problem 2.33E: A small block has constant acceleration as it slides down a frictionless incline. The block is... Problem 2.34E: At the instant the traffic light turns green, a car that has been waiting at an intersection starts... Problem 2.35E: (a) If a flea can jump straight up to a height of 0.440 m, what is its initial speed as it leaves... Problem 2.36E: A small rock is thrown vertically upward with a speed of 22.0 m/s from the edge of the roof of a... Problem 2.37E: A juggler throws a bowling pin straight up with an initial speed of 8.20 m/s. How much time elapses... Problem 2.38E: You throw a glob of putty straight up toward the ceiling, which is 3.60 m above the point where the... Problem 2.39E: A tennis ball on Mars, where the acceleration due to gravity is 0.379g and air resistance is... Problem 2.40E: Touchdown on the Moon. A lunar lander is making its descent to Moon Base I (Fig. E2.40). The lander... Problem 2.41E: A Simple Reaction-Time Test. A meter stick is held vertically above your hand, with the lower end... Problem 2.42E: A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in... Problem 2.43E: Launch Failure. A 7500-kg rocket blasts off vertically from the launch pad with a constant upward... Problem 2.44E: A hot-air balloonist, rising vertically with a constant velocity of magnitude 5.00 m/s, releases a... Problem 2.45E: BIO The rocket-driven sled Sonic Wind No. 2, used for investigating the physiological effects of... Problem 2.46E: An egg is thrown nearly vertically upward from a point near the cornice of a tall building. The egg... Problem 2.47E: A 15-kg rock is dropped from rest on the earth and reaches the ground in 1.75 s. When it is dropped... Problem 2.48E: A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s.... Problem 2.49E: You throw a small rock straight up front the edge of a highway bridge that crosses a river. The rock... Problem 2.50E: CALC A small object moves along the x-axis with acceleration ax(t) = (0.0320 m/s3)(15.0 s t). At t... Problem 2.51E: CALC A rocket starts from rest and moves upward from the surface of the earth. For the first 10.0 s... Problem 2.52E: CALC The acceleration of a bus is given by ax(t) = t, where = 1.2 m/s3. (a) If the buss velocity at... Problem 2.53E: CALC The acceleration of a motorcycle is given by ax(t) = At Bt2, where A = 1.50 m/s3 and B = 0.120... Problem 2.54E: BIO Flying Leap of the Flea. High-speed motion pictures (3500 frames/second) of a jumping, 210-g... Problem 2.55P: BIO A typical male sprinter can maintain his maximum acceleration for 2.0 s. and his maximum speed... Problem 2.56P: CALC A lunar lander is descending toward the moons surface. Until the lander reaches the surface,... Problem 2.57P: Earthquake Analysis. Earthquakes produce several types of shock waves. The most well known are the... Problem 2.58P: A brick is dropped from the roof of a tall building. After it has been falling for a few seconds, it... Problem 2.59P: A rocket carrying a satellite is accelerating straight up from the earths surface. At 1.15 s after... Problem 2.60P: A subway train starts from rest at a station and accelerates at a rate of 1.60 m/s2 for 14.0 s. It... Problem 2.61P: A gazelle is running in a straight line (the x-axis). The graph in Fig. P2.61 shows this animals... Problem 2.62P: Collision. The engineer of a passenger train traveling at 25.0 m/s sights a freight train whose... Problem 2.63P: A ball starts from rest and rolls down a hill with uniform acceleration, traveling 200 m during the... Problem 2.64P: Two cars start 200 m apart and drive toward each other at a steady 10 m/s. On the front of one of... Problem 2.65P: A car and a truck start from rest at the same instant, with the car initially at some distance... Problem 2.66P: You are standing at rest at a bus stop. A bus moving at a constant speed of 5.00 m/s passes you.... Problem 2.67P: Passing. The driver of a car wishes to pass a truck that is traveling at a constant speed of 20.0... Problem 2.68P: CALC An objects velocity is measured to be vx(t) = t2, where = 4.00 m/s and = 2.00 m/s3, At t =... Problem 2.69P: CALC The acceleration of a particle is given by ax(t) = 2.00 m/s2 + (3.00 m/s3)t. (a) Find the... Problem 2.70P: Egg Drop. You are on the roof of the physics building, 46.0 m above the ground (Fig. P2.70). Your... Problem 2.71P: A certain volcano on earth can eject rocks vertically to a maximum height H. (a) How high (in terms... Problem 2.72P: An entertainer juggles balls while doing other activities. In one act, she throws a ball vertically... Problem 2.73P: Look Out Below. Sam heaves a 16-lb shot straight up, giving it a constant upward acceleration from... Problem 2.74P: A flowerpot falls off a windowsill and passes the window of the story below. Ignore air resistance.... Problem 2.75P: Two stones are thrown vertically upward from the ground, one with three times the initial speed of... Problem 2.76P: A Multistage Rocket. In the first stage of a two-stage rocket, the rocket is fired from the launch... Problem 2.77P: During your summer internship for an aerospace company, you are asked to design a small research... Problem 2.78P: A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and... Problem 2.79P: A helicopter carrying Dr. Evil takes off with a constant upward acceleration of 5.0 m/s2. Secret... Problem 2.80P: Cliff Height. You are climbing in the High Sierra when you suddenly find yourself at the edge of a... Problem 2.81P: CALC An object is moving along the x-axis. At t = 0 it has velocity 0x = 20.0 m/s. Starting at time... Problem 2.82P: A ball is thrown straight up from the ground with speed 0. At the same instant, a second ball is... Problem 2.83P: CALC Cars A and B travel in a straight line. The distance of A from the starting point is given as a... Problem 2.84P: DATA In your physics lab you release a small glider from rest at various points on a long,... Problem 2.85P: DATA In a physics lab experiment, you release a small steel ball at various heights above the ground... Problem 2.86P: DATA A model car starts from rest and travels in a straight line. A smartphone mounted on the car... Problem 2.87CP: In the vertical jump, an athlete starts from a crouch and jumps upward as high as possible. Even the... Problem 2.88CP: Catching the Bus. A student is running at her top speed of 5.0 m/s to catch a bus, which is stopped... Problem 2.89CP: A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from... Problem 2.90PP: BIO BLOOD FLOW IN THE HEART. The human circulatory system is closedthat is. the blood pumped out of... Problem 2.91PP: BIO BLOOD FLOW IN THE HEART. The human circulatory system is closedthat is. the blood pumped out of... Problem 2.92PP: BIO BLOOD FLOW IN THE HEART. The human circulatory system is closedthat is. the blood pumped out of... format_list_bulleted