Velocity

A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is near the outer edge, while the girl is closer to the center. Which statements are true? (Give ALL correct answers: B, AC, BCD.., or None) A) The boy has the greater linear velocity B) Both have the same non-zero tangential accele ...continues

True and false questions about torque, a stick and a hanging mass. Question images in JPG format.

Shown below are six figures in which a student is holding a meter stick horizontally. In these figures, the length of the meter stick is denoted as L. All of the meter sticks are identical, but the objects hanging from the sticks vary in mass and position. The objects have masses of 500 g, 750 g or 1000 g as indicated in the fig ...continues

Cube in water: density, volume and force calculations

Imagine that you have a solid cube composed of Material X. You put the cube into a beaker filled with water. The cube sinks to the bottom of the beaker and sits there, at rest, on the bottom. Which of the following statements are true? (Give ALL correct answers: B, AC, BCD, ... , or None) A) The buoyant force on the cub ...continues

Calculating the linear velocity of a clock hand.

The minute hand of a clock has a length of 6.0 cm. What is the linear velocity of the tip of the minute hand of this clock?

pressure under water

At the surface of a fresh water lake, you feel an absolute pressure that is equal to the normal atmospheric pressure (1 atm = 1.013à—105 Pa). How deep do you have to go in order to feel an absolute pressure of 5.1 atm?

Calculating the tension of a string.

A solid object made out of lead has a volume of 24.0 cm3 and is supported (from above) by a string while the object is completely submerged in water. What is the tension in the string?

True and false questions regarding buoyancy and density.

Five solid objects made of different materials are placed in a tub of water. The objects are cubes made of wood, ice, aluminum, steel and gold. All of the objects have the SAME mass. The objects are released and allowed to reach some equilibrium position. Note that some of the objects will float, while others will sink. Whic ...continues

flow rate

An ideal fluid flows at 15.5 m/s in a horizontal pipe. Further down the line, the pipe diameter changes to one-half its original diameter. What is the flow speed of the fluid in this new section of pipe?

person on beam

A 11.2 m uniform beam of weight 140 N is supported by two ropes at the ends. If a 420 N person sits 3.5 m from the left end of the beam, what is the tension in the right rope?

Determining the location of a fulcrum to balance a system.

Two metal disks are taped to a meter stick. The mass of the meter stick is 540.0 g. Disk 1 has a mass of 500.0 g and is located at the 29.0 cm mark. Disk 2 has a mass of 300.0 g and is located at the 76.0 cm mark. At what position along the meter stick should you place a fulcrum so that the entire system (meter stick plus the 2 ...continues