Questions from College Physics

Q: A 3000 kg truck is about to tow a 1250 kg car

A 3000 kg truck is about to tow a 1250 kg car up a hill that makes an angle of α = 10° with respect to the horizontal. The rope attached from the truck to the car makes an ang...

Q: A volunteer firefighter holds the end of a firehose as a strong

A volunteer firefighter holds the end of a firehose as a strong jet of water emerges. (a) The hose exerts a large backward force on the firefighter. Explain the origin of this force. (b) If another...

Q: The tension in a ligament in the human knee is approximately proportional

The tension in a ligament in the human knee is approximately proportional to the extension of the ligament, if the extension is not too large. If a particular ligament has an effective spring constant...

Q: An object moves in SHM. Its position as a function of

An object moves in SHM. Its position as a function of time is x(t) = A cos ωt. (a) Apply conservation of energy to show that vx(t) = ±ωA sin ωt. [Hint: See Appendix A.7 for a useful trigonometric ide...

Q: An electron is suspended in a vacuum between two oppositely charged horizontal

An electron is suspended in a vacuum between two oppositely charged horizontal parallel plates. The separation between the plates is 3.00 mm. (a) What are the signs of the charge on the upper and on...

Q: A harpsichord string of length 1.50 m and linear mass

A harpsichord string of length 1.50 m and linear mass density 25.0 mg/m vibrates at a fundamental frequency of 450.0 Hz. (a) What is the speed of the transverse string waves? (b) What is the tension...

Q: The focal length of a concave mirror is 4.00 m

The focal length of a concave mirror is 4.00 m and an object is placed 3.00 m in front of the mirror. Describe the image in terms of real, virtual, upright, and inverted.

Q: A gibbon, hanging onto a horizontal tree branch with one arm

A gibbon, hanging onto a horizontal tree branch with one arm, swings with a small amplitude. The gibbon’s CM is 0.40 m from the branch, and its rotational inertia divided by its mass is I/m = 0.25 m2....

Q: Would heat loss be reduced or increased by increasing the air gap

Would heat loss be reduced or increased by increasing the air gap, usually about 1 cm, between commercially made double-paned windows? Explain your reasoning. [Hint: Consider convection.]

Q: When a double slit is illuminated with light of wavelength 510 nm

When a double slit is illuminated with light of wavelength 510 nm, the interference maxima on a screen 2.4 m away gradually decrease in intensity on either side of the 2.40 cm wide central maximum and...