StressedStudent

A train consists of 50 cars, each of which has a mass of 7.2 × 103 kg. The train has an acceleration of +7.2 × 10-2 m/s2. Ignore friction and determine the tension in the coupling (a) between the 30th and 31st cars and (b) between the 49th and 50th cars.

13 years ago

A massless rope passes over a massless, frictionless pulley. One end of the rope is connected to box 2, and the other end is connected to box 3. The weights of the three boxes are W1 = 50.7 N, W2 = 32.1 N, and W3 = 28.6 N. Determine the magnitude of the n...

13 years ago

A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000...

13 years ago

If you suddenly multiplied the mass of Earth by a factor of 4, how would the period of a satellite change, if the radius of its orbit did not change? 4 times as long 1/4 as long 2 times as long 1/2 as long Unchanged

13 years ago

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.77 m. With the string hanging vertically, the object is given an initial velocity of 1.8 m/s parallel to the ground and...

13 years ago

A baby turtle swings on a playground swing. If his turtle mom comes and sits with him, the period of the swing's oscillation will: a.Increase b.Decrease c.Stay the same

12 years ago

A long, thin rod is cut into two pieces, one being twice as long as the other. To the midpoint of piece A (the longer piece), piece B is attached perpendicularly, in order to form the inverted “T” shown in the drawing. The application of a net external to...

12 years ago

A solid circular disk has a mass of 1.67 kg and a radius of 0.144 m. Each of three identical thin rods has a mass of 0.351 kg. The rods are attached perpendicularly to the plane of the disk at its outer edge to form a three-legged stool (see the figure)....

12 years ago

Consider a cube of an unknown material. When heated by 10 K, each side expands by 1%. Using *only this information*, what is the ratio between the coefficent of volume expansion and the coefficient of linear expansion (i.e., beta/alpha)? Express your answ...

12 years ago

Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.8 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this ma...

12 years ago

When you blow on a spoonful of soup to cool it, this is an example of: Natural convection Forced convection Conduction

12 years ago

The igloo shown at the very start of chapter 13 is meant to keep out the cold. Which would work better: an igloo made of ice 15cm thick or an igloo made out of concrete 15cm thick? Ice Concrete

12 years ago

Assuming there is no conduction or convection operating, a cold object in a warm room: A.Radiates more energy than it absorbs B.Absorbs more energy than it radiates C.Only absorbs energy; it does not radiate because it is colder than its environment.

12 years ago

Which kind of pot would be better to use on a halogen cooktop? A. A shiny stainless steel pot B. A black cast iron pot C. It's equally OK to use either as long as you adjust the thickness so that the heat conduction is the same.

12 years ago

An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 8 °C is 6.9 × 10-4 m3. The coefficient of volume expansion for aluminum is 69 × 10-6 (C°)-1...

12 years ago

A 1.24g sample of a hydrocarbon, when completely burned in excess of O2(g), yields 4.04g CO2 and 1.24g H20. Determine the empirical formula.

12 years ago

The equilibrium bond length of 1 H35Cl is 126 pm. What is wavelength of the required electromagnetic radiation to excite the rotational state from j=1 to j=2? The masses of 1H and 35Cl are 1.0078 amu and 34.9689 amu, respectively)

12 years ago

What is the radius of the largest sphere that can be placed at the center of a face-centered cubic unit cell of a cubic closest-packed array of spheres if the spheres have radius of 2.0 x 10^2 pm?

12 years ago

How did the U.S.-Japan relationship evolve in the years immediately following World War II?

2 years ago

I still am not understanding how to obtain the answer

13 years ago

what does "u" stand for?

13 years ago

Use the quadratic formula and that will give you the answer

13 years ago

subtract the two to the other side and then use the quadratic formula to factor the variables

13 years ago

Those two values will have the same value if put in the way you wrote it. If the equation was written like: (5+5)^3 it would yield a different amount rather than 5+5^3. So,it all depends on how the equation is written.

12 years ago

electrons

12 years ago

Since "feature" isn't plural, does this mean that the subject-verb agreement is incorrect?

2 years ago

Correct answer: C. its social classes D. its written code of law

1 year ago

Which of the following is a minority ethnic group in several countries despite occupying a large area of the region? Kurds Which of the following is a minority ethnic group in several countries despite occupying a large area of the region? Women pursuing...

1 year ago