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Questions in physics

[Answered] The formula $\sqrt{\frac{ L }{32}}$ gives the time it takes in seconds, $T$, for a pendulum to make one full swing back and forth, where $L$ is the length of the pendulum, in feet. To the nearest foot, what is the length of a pendulum that makes one full swing in 1.9 s? Use 3.14 for $\pi$. ____ ft

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] What's the electrical and magnetic volume susceptibility of water under different circumstances, including light frequency, temperature, pressure, and in different forms?

[Answered] Calculate the following and state your answer in scientific notation: \[\frac{(3 \times 10^2 \text{ kg})(4.0 \text{ km})}{5 \times 10^2 \text{ s}^2}\]

[Answered] While researching a topic, a student has taken the following notes: * Yoji Totsuka is a Japanese particle physicist. * Particle physicists study subatomic particles. * Neutrinos are some of the least understood subatomic particles. * Neutrinos were first discovered in the mid-twentieth century. * Totsuka is known for his discovery of atmospheric muon-neutrino oscillations. The student wants to provide an example of a particle physicist whose research focuses on neutrinos. Which choice most effectively uses relevant information from the notes to accomplish this goal? A. Particle physicist Yoji Totsuka is known for his discovery of atmospheric muon-neutrino oscillations. B. Neutrinos are a type of subatomic particle that particle physicists are still trying to understand. C. By studying atmospheric muon-neutrino oscillations—to name just one example—particle physicists can learn more about neutrinos. D. The research done on atmospheric muon-neutrino oscillations exemplifies the work particle physicists do to advance our understanding of subatomic particles.

[Answered] 5. A force that acts along the two surfaces in contact and opposes the motion of one object over another is called the ____. A. Gravitational force B. Contact force C. Frictional force D. Pull force Q2. Answer the following questions: 1. Define weight. 2. What happens when the bar magnet is moved closer to the iron nail? Give reason for your answer. 3. State the effect of force. 4. State one point of difference between electrostatic force and gravitational force.

[Answered] The efficiency of a machine can be increased by A. decreasing distance. B. decreasing force. C. reducing friction. D. reducing work.

[Answered] A toy plane has a mass of 2.5 kg and is 18 m above the ground. It is moving at [tex]$4.5 m / s$[/tex]. How much mechanical energy does the toy plane have? A. 416 J B. 441 J C. 466 J D. 491 J

[Answered] What's the relationship between the temperature and the density of a substance? A. As the temperature increases, the density decreases. B. Temperature doesn't affect the density of a substance. C. As the temperature decreases, the density decreases. D. Temperature decreases the density of a substance only at high altitudes.

[Answered] The mass to charge ratio for A⁺ ions is 1.97×10⁻⁷ kg C⁻¹. Calculate the mass of A atom. (A) 3.155×10⁻²⁶ kg (B) 3.155×10²⁹ kg (C) 31.55×10²⁶ kg (D) 6.155×10²⁸ kg