Suppose you viewed a movie that was running backwards. You would see lots of odd

Suppose you viewed a movie that was running backwards. You would see lots of odd things happening: streams would flow uphill, and so forth. If these odd "backward-moving" things actually happened in nature, which principle or principles of

When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a ...

When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is a. in the direction of the charge Q1 or Q2 of smaller magnitude. b. in the direction of the charge

In the figure, a stunt car driver negotiates the frictionless track shown in such a way that the car ...

[html]In the figure, a stunt car driver negotiates the frictionless track shown in such a way that the car is barely in contact with the track at the top of the loop. The radius of the t

A ship is being pulled through a harbor at constant velocity by two tugboats as shown in the figure. ...

[html]A ship is being pulled through a harbor at constant velocity by two tugboats as shown in the figure. The lines attached to the two tugboats have the same tension of 200,000 N. Eac

You throw a baseball horizontally, and Jill catches it. Neglect air resistance.

You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the throw [while the ball is in your hand] is

Balloons expand when they are heated because A) the molecules inside expand when they are heated. B) the molecules inside become more massive. C) the molecules inside are moving faster. D) of the additiona

La Paz, Bolivia, is at an altitude of 3,650 meters above sea level. In La Paz, water will boil

La Paz, Bolivia, is at an altitude of 3,650 meters above sea level. In La Paz, water will boil A) at 100°C. B) below 100°C. C) above 100°C. D) There is not enough information to answer this question.

An object of length 3.00 cm is inside a plastic block with index of refraction 1.40 . If the object ...

An object of length 3.00 cm is inside a plastic block with index of refraction 1.40 . If the object is viewed through the top surface of the block at a non-zero angle from the normal, where is the object relative to its image? a. in the same d

"Time-of-day" pricing of electricity could help to

"Time-of-day" pricing of electricity could help to A) reduce the need for new power plants by encouraging users to use less electric energy. B) reduce total electric energy use by encouraging users to use el

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2.(a) ...

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s2. (a) How long after beginning to accelerate does it take the car to move 3.50 km? (b) How fast is the car moving just as it has traveled 3.50 km

In a ballistics test, a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and ...

In a ballistics test, a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. (a) What is the magnitude of the average acceleration of the bullet in the sandbag? (b) How many milliseconds

Copernicus used the fact that Mars can sometimes be seen high in our sky at midnight to conclude ...

Copernicus used the fact that Mars can sometimes be seen high in our sky at midnight to conclude that A) the Sun can come between the Earth and Mars. B) the Earth can come between Mars and the Sun. C) Mars and the Sun can never be on t

If you run a 3000-watt hair dryer for 30 minutes, how much electric energy do yo

If you run a 3000-watt hair dryer for 30 minutes, how much electric energy do you consume? A) 90,000 kW · h B) 6 kW · h C) 100 kW · h D) 1.5 kW · h E) None of the above.

The energy conversion represented by an automobile speeding up along a level roa

The energy conversion represented by an automobile speeding up along a level road is A) thermal to chemical. B) gravitational to kinetic. C) kinetic to chemical. D) chemical to kinetic. E) chemical t

A person makes iced tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms ...

A person makes iced tea by adding ice to 1.8 kg of hot tea, initially at 80°C. How many kilograms of ice, initially at 0°C, are required to bring the mixture to 10°C? The specific heat of water (and tea) is 4186 J/kg ∙ K, and the latent heat of

Lisa runs up 4 flights of stairs in 22. seconds. She weighs 510. Newtons. If each flight rises 310. ...

Lisa runs up 4 flights of stairs in 22. seconds. She weighs 510. Newtons. If each flight rises 310. cm: (a) What is her change in potential? (b) What average power (watts) was required during the 22. s? (c) What minimum horsepowe

Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before ...

Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below. Ignore air. Just as the rock reaches the water, find (a) the horizontal component of its velocity. (b) the speed with

A 350-g air track cart on a horizontal air track is attached to a string that goes over a ...

A 350-g air track cart on a horizontal air track is attached to a string that goes over a frictionless pulley with a moment of inertia of 6.00 × 10-6 kg ∙ m2 and a radius of 1.35 cm. If the string is pulled vertically downward by a force of 2.50 N, (

Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If an ...

Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If an electrostatic force of magnitude 2.0 N is exerted on each coin by the other coin, how large is the charge on each coin? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns ...

A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes,

A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable ...

A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart ...

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2. What is the magnitude of the charge on each bead? (k = 1/4

A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in ...

[html]A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure. What is the magnitude of the force F?

You push your physics book across your desk, leaving the book at rest on the des

You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?

A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no ...

A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air, at what angle above the horizontal did it leave the ground?

A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 ...

A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long do

A projectile returns to its original height 4.08 s after being launched, during which time it ...

A projectile returns to its original height 4.08 s after being launched, during which time it travels 76.2 m horizontally. If air resistance can be neglected, what was the projectile's initial speed?

The power of American automobiles is usually rated in "horsepower." What other u

The power of American automobiles is usually rated in "horsepower." What other units could be used? A) Calories B) watts C) joules D) None of the above. E) All of the above.

Two harmonic waves traveling in opposite directions interfere to produce a standing wave described ...

Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 4sin(5x)cos(6t) where x is in m and t is in s. What is the approximate frequency of the interfering waves? a. 3 Hz b. 1 Hz

A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck ...

A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right. If the bat exerted an average force of 1275 N on the ba

A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ...

A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ball? (ρFe = 7.87 g/cm3, ρwater = 1.00 g/cm3) A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm

A 7.5-kg stone moves up frictionless hill that slopes upward at 41° above the horizontal. If the ...

A 7.5-kg stone moves up frictionless hill that slopes upward at 41° above the horizontal. If the stone has an initial velocity of 8.5 m/s at the bottom, how far (as measured along the surface of the hill) will it go before stopping?

A 23 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long. There ...

A 23 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long. There is no appreciable friction between the nail and the string. If the tension in the string is 51 N while the mass moves in a uniform circle on the table,

Two baseballs are released at the same time. One is dropped from rest and the other is given an ...

Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag. a. Both baseballs hit the ground at the same time.

The king's chamber of the great pyramid is 10.43 meters long, 5.21 meters wide, and 5.82 meters ...

The king's chamber of the great pyramid is 10.43 meters long, 5.21 meters wide, and 5.82 meters high. What is the volume of the chamber in cubic feet? A) 316 cubic feet B) 3,720 cubic feet C) 6,530 cubic feet D) 11,200 cubic