The average density of the material in intergalactic space is approximately 2.5 × 10–27 kg/m3.  What is the volume of a lead sample, r = 11 300 kg/m3, that has the same mass as 8 × 1024 m3 of intergalactic space?

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.4 kgm2 and an angular velocity of 7.2 rad/s. Disk B is rotating with an angular velocity of −9.8 rad/s. The two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of −2.4 rad/s. The axis of rotation for this unit is the same as that for the separate disks. What is the moment of inertia of disk B?

Alexa’s hair grows with an average speed of 3.5 × 10–9 m/s. How long (in years) does it take her hair to grow 0.3 m?

The drawing shows two 44.1 N balls located on the y axis at 1 m and 9 m, respectively, and a third ball with a weight of 22.5 N which is located at 6 m. What is the location of the center of gravity of this system?

A tennis ball has a mass of 56 g and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted on the tennis ball by the earth.

A race car has a speed of 80 m/s when the driver releases a drag parachute. If the parachute causes a deceleration of –4 m/s2, how far will the car travel before it stops?

During a relay race, runner A runs a certain distance due north and then hands off the baton to runner B, who runs for the same distance in a direction south of east. The two displacement vectors A→{“version”:”1.1″,”math”:”A→”}  and B→{“version”:”1.1″,”math”:”B→”}  can be added together to give a resultant vector. Which drawing correctly shows the resultant vector?

A boat is being pulled up the middle of a canal at a steady speed by two horses, one on each side of the canal. The ropes tying the boat to the horses each make an angle of 30° with the lengthwise direction of the canal. If the force exerted on each horse by its rope is 2000 N, how much force would a single rope need to accomplish the same effect as the two forces added together?

The surface of a lake has an area of 1.67 x 108 ft2. What is the area of the lake in m2?

When considering the stability of IQ, which of the following statements is MOST likely to be true?