Physics Questions from Dec 10,2024

Browse the Physics Q&A Archive for Dec 10,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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An object weighs 100. newtons on Earth's surface. When it is moved to a point one Earth radius above Earth's surface, it will weigh \( \begin{array}{llll}\text { A) } 50.0 \mathrm{~N} & \text { B) } 25.0 \mathrm{~N} & \text { C) } 100 . \mathrm{N} & \text { D) } 400 . \mathrm{N} \\ \text { EXPLAIN YOUR ANSWER: } & \end{array} \) As an astronaut travels from the surface of Earth to a position that is four times as far away from the center of Earth, the astronaut's \( \begin{array}{ll}\text { A) weight remains the same } & \text { C) mass decreases } \\ \text { B) mass remains the same } & \text { D) weight increases }\end{array} \) Exercise 9 As a meteor moves from a distance of 16 Earth radii to a distance of 2 Earth radii from the center of Earth, the magnitude of the gravitational force between the meteor and Earth becomes kan dengan persamaan \( E=h \frac{c}{\lambda} \). Berdasar- kan persamaan tersebut, energi foton dipengaruhi oleh konstanta Planck \( \left(6,6 \times 10^{-34} \mathrm{Js}\right) \), cepat rambat cahaya \( \left(3 \times 10^{8} \mathrm{~m} / \mathrm{s}\right) \), dan panjang gelombang. Jika sinar memiliki panjang gelombang \( 2,5 \times 10^{-7} \mathrm{~m} \), besar energi foton berdasarkan notasi ilmiah adalah . . . a. \( 0,792 \times 10^{-19} \mathrm{~J} \) d. \( 7,92 \times 10^{-19} \mathrm{~J} \) c. \( 0,792 \times 10^{-18} \mathrm{~J} \) d. \( 0,792 \times 10^{-17} \mathrm{~J} \) e. \( 7,92 \times 10^{-15} \mathrm{~J} \) Exercise 17 - Rocket science! A spacecraft is at rest in gravity-free space when its pilot decides to accelerate forward. He turns on the thrusters. and burned fuel is ejected. The mass of fuel ejected each second is \( 2.0 \times 10^{2} \mathrm{~kg} \) and the speed of each fuel particle is \( 2.5 \times 10^{\circ} \mathrm{m} / \mathrm{s} \). a) What is the thrust (the force applied to the rocket by the ejected fuel) on the spacecraft? The kinetic energy \( K \) of a moving object varies directly with the square of its speed \( v \). If \( K=450 \mathrm{~J} \) when \( v=30 \mathrm{~m} / \mathrm{s} \), what is the speed when \( K=800 \mathrm{~J} \) ? \( 35.5 \mathrm{~m} / \mathrm{s} \) \( 37.5 \mathrm{~m} / \mathrm{s} \) \( 42.5 \mathrm{~m} / \mathrm{s} \) \( 40 \mathrm{~m} / \mathrm{s} \) The kinetic energy \( K \) of a moving object varies directly with the square of its speed \( v \). If \( K=450 \mathrm{~J} \) when \( v=30 \mathrm{~m} / \mathrm{s} \), what is the equation that relates \( K \) and \( v \) ? \( K=0.5 v^{2} \) \( K=2 v \) \( K=2 v^{2} \) \( K=0.5 v \) Exercise 16 What will be the distance of separation between two objects of mass 75 kg and 89 kg respectively, if the gravitational force between them is \( 8.5 \times 10^{-7} \mathrm{~N} ? \) 2) Which of the following statements is true? A: Light travels at the same speed as sound. B: Sound travels faster than light. C: Light travels faster than sound. D: The speed of light and sound depends on the temperature. 1) Which of the following is a mechanical vibration? \( \begin{array}{lll}\text { A: Sound } & \text { B: Light } & \text { C: Water } \\ \text { D: Reflection }\end{array} \)
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