Questions from College Physics

Q: An electromagnetic flowmeter is to be used to measure blood speed.

An electromagnetic flowmeter is to be used to measure blood speed. A magnetic field of 0.115 T is applied across an artery of inner diameter 3.80 mm. The Hall voltage is measured to be 88.0 μV. What i...

Q: Luke is trying to catch a pesky animal that keeps eating vegetables

Luke is trying to catch a pesky animal that keeps eating vegetables from his garden. He is building a trap and needs to use a spring to close the door to his trap. He has a spring in his garage, and h...

Q: An object with a charge of 0.890 µC is placed

An object with a charge of 0.890 µC is placed at the center of a cube. What is the electric flux through one surface of the cube?

Q: Find the radius and volume of the / nucleus

Find the radius and volume of the / nucleus.

Q: In a simple model, the electron in a hydrogen atom orbits

In a simple model, the electron in a hydrogen atom orbits the proton at a radius of 53 pm and at a constant speed of 2.2 × 106 m/s. The orbital motion of the electron gives it an orbital magnetic dipo...

Q: A spaceship of mass m is traveling away from Earth at speed

A spaceship of mass m is traveling away from Earth at speed v. Its momentum has magnitude 2.5mv. (a) Find v. (b) An astronaut on the spaceship has a watch that ticks once every second. How often doe...

Q: Convert these to radian measure: (a) 30.

Convert these to radian measure: (a) 30.0°, (b) 33.3 revolutions.

Q: A 0.50 kg block, starting at rest, slides

A 0.50 kg block, starting at rest, slides down a 30.0° incline with static and kinetic friction coefficients of 0.35 and 0.25, respectively (see the figure with Problem 75). After sliding 85 cm along...

Q: A hair breaks under a tension of 1.2 N.

A hair breaks under a tension of 1.2 N. What is the diameter of the hair? The tensile strength is 200 MPa.

Q: Suppose that current flows to the left through the inductor in Fig

Suppose that current flows to the left through the inductor in Fig. 21.7a so that i is negative. (a) If the current is increasing in magnitude, what is the sign of Δi/Δt? (b) In what direction is th...