A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad ...

A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a mass of 6.25 104 kg, how many bullets of mass 25 g would have to be fired at 250 m/s off the back to give the railroad car a forward veloc

At the same moment from the top of a building 3.0 × 102 m tall, one rock is dropped and one is ...

At the same moment from the top of a building 3.0 × 102 m tall, one rock is dropped and one is thrown downward with an initial velocity of 10 m/s. Both of them experience negligible air resistance. How much EARLIER does the thrown rock strike the gro

A 20-g bead is attached to a light 120-cm-long string as shown in the figure. This bead moves in a ...

[html]A 20-g bead is attached to a light 120-cm-long string as shown in the figure. This bead moves in a horizontal circle with a constant speed of 1.5 m/s. What is the tension in the string if the angle α is

As shown in the figure, a 10.0 m long bar is attached by a frictionless hinge to a wall and held ...

[html]As shown in the figure, a 10.0 m long bar is attached by a frictionless hinge to a wall and held horizontal by a light rope that makes an angle θ = 49° with the bar. The bar is uniform and weighs

) In Situation 24.1, the object is moved to a new position, such that the new

) In Situation 24.1, the object is moved to a new position, such that the new lateral magnification is +2.5. The new object distance, in cm, is closest to:

You have already determined the magnitude of the momentum of the combined vehicles just after impact ...

You have already determined the magnitude of the momentum of the combined vehicles just after impact and the kinetic energy before and after the impact. The following vector diagram illustrates the direction of the momentum vector based on evidence f

Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite ...

Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite corners of a 60-cm 80-cm rectangle. If point A is the corner of this rectangle nearest the positive charge and point B is located at the intersecti

A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away ...

A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s. A) 378 Hz B) 389 Hz C) 411

A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index ...

A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index 1.50) at an angle of incidence of 60.0°. What is the angle of refraction in the glass? A) 27.5° B) 39.8° C) 60.0° D) 90.0° E) 50.

The system moves at 1.50 2 m/s while the inclined planes are rough. a) Determine the coefficient o

The system moves at 1.50 2 m/s^2 while the inclined planes are rough. a) Determine the coefficient of kinetic friction between the incline and the blocks, assuming that they are the same on both sides. b) Calculate also the tension in the s

A force in the +y direction applied at the point x = 2.3m, y = 1.4 m gives r

A force in the +y direction applied at the point x = 2.3m, y = 1.4 m gives rise to a torque of 57 N·m about the origin. Find the magnitude of the force. A)

Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 ...

Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 km from the asteroid's center, he should maintain a speed of 80 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N • m2/kg2)

Three point charges lie on the x x axis. Charge 1 (+9.9 μC μ C ) is at the origin, charge 2 (-5.1 .

Three point charges lie on the x axis. Charge 1 (+9.9 μC) is at the origin, charge 2 (-5.1 μC) is at x =12 cm, and charge 3 (+4.4 μC) is at x = 15 cm. k=8.99×109N⋅m2/C2.

A 1484 kg car climbs a 5.0° slope at a constant velocity of 80.0 km/h. Assum

A 1484 kg car climbs a 5.0° slope at a constant velocity of 80.0 km/h. Assuming that air resistance may be neglected, at what rate must the engine deliver energy to the drive wheels of the car? Express your answer in kW.

A glass plate whose index of refraction is 1.62 is immersed in a liquid. The su

A glass plate whose index of refraction is 1.62 is immersed in a liquid. The surface of the glass is inclined at an angle of 28° with the vertical. A horizontal ray in the glass is incident on the interface. When the liquid is a certain a

Charge, then brought near (i.e., within about 1/10 the length of the rod) to end A of the rod. What

A small metal ball is given a negative charge, then brought near (i.e., within about 1/10 the length of the rod) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time?

Tuning forks are used to diagnose a nervous system disorder that has reduced sensitivity to vibratio

Tuning forks are used to diagnose a nervous system disorder that has reduced sensitivity to vibrations as a symptom. The medical tuning fork in (Figure 1) has a frequency of 139 Hz H z . What is its period of oscillation? Ex

A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many ...

A rectangular box of negligible mass measures 5.0 m long, 1.0 m wide, and 0.50 m high. How many kilograms of material can be loaded onto the box before it sinks in a lake having water of density 1000 kg/m3? A) 0.50 × 103 kg B) 1.5 × 1

When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the ...

When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V. What is the threshold (cutoff) frequency of this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 ...

Light with a frequency of 8.70 × 1014 Hz is incident on a metal that has a work function of 2.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s) A) 8

A horizontal force of magnitude 6.5 N is exerted tangentially on a Frisbee of mass 32 grams and ...

A horizontal force of magnitude 6.5 N is exerted tangentially on a Frisbee of mass 32 grams and radius 14.3 cm. Assuming the Frisbee, a uniform disk, is originally at rest and the force is exerted for 0.08 s, determine the angular velocity of rotatio

An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is

An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is A) 0.1 s. B) 1 s. C) 10 s. D) 20 s. E) more than 20 s.

Pour two liters of water at 40C into one liter of water at 20C and the final temperature of the two becomes

Pour two liters of water at 40C into one liter of water at 20C and the final temperature of the two becomes A) less than 30C. B) at or about 30C. C) more than 30C.

A spaceship is moving between two distant stars at 0.932 c. To someone in the sh

A spaceship is moving between two distant stars at 0.932 c. To someone in the ship, the distance between the two stars appears to be 21.7 ly. What is the distance between the stars in the stars' rest frame? A) 59.9 ly B)

A 2.50-kg stone is dropped from rest at a height of 3.75 m. What impulse does gravity impart to this ...

A 2.50-kg stone is dropped from rest at a height of 3.75 m. What impulse does gravity impart to this stone from the instant it is dropped until it hits the ground, assuming negligible air resistance?

A drinking glass has a diameter of 2.5 inches and is 5.5 inches tall. What is the volume of the ...

A drinking glass has a diameter of 2.5 inches and is 5.5 inches tall. What is the volume of the drinking glass in cubic centimeters? A) 170 cubic cm B) 440 cubic cm C) 350 cubic cm D) 710 cubic cm E) 530 cubic cm

If a cup of tea at room temperature, 24C is heated until it has twice the internal energy, unlike a ...

If a cup of tea at room temperature, 24C is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be A) 48C. B) 100C. C) 321C. D) 594C. E) none of the above

A 200-Ω resistor, a 40.0-mH inductor and a 2.00-μF capacitor are connected in series with a 120-V ...

A 200-Ω resistor, a 40.0-mH inductor and a 2.00-μF capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the impedance of this circuit? A) 164 Ω B) 120 Ω C) 264 Ω D) 200 Ω E) 364 Ω

Asteroid 433 Eros is one of the largest near-Earth asteroids. For purposes of th

Asteroid 433 Eros is one of the largest near-Earth asteroids. For purposes of this problem, assume it is spherical. The value of g at its surface is 0.00600 m/s2 and the escape velocity is only 9.95 m/s. What is the radius of Eros? A) 8250

What will happen to the resistance of a conductor if it increases its 1. length, 2. fattening, 3. decrease in electrical resistivity, 4. increase in electrical conductivity, 5. increase in temperature, 6. decrease in length, 7. thinning?