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Home Question Bank Physics Archive 2024 December 21

Physics Questions from Dec 21,2024

Browse the Physics Q&A Archive for Dec 21,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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3.31 - A "esteira rolante horizontal" do terminal de um aero- porto se move a \( 1,0 \mathrm{~m} / \mathrm{s} \) e tem \( 35,0 \mathrm{~m} \) de comprimento. Se uma mulher pisa em uma das extremidades e caminha a \( 1,5 \mathrm{~m} / \mathrm{s} \mathrm{em} \) relaçāo à plataforma móvel, de quanto tempo ela necessita para chegar à extremidade oposta, se andar (a) na mesma direção em que a plataforma se move? (b) Na direção oposta? A ball is dropped from a height of 2 metres and bounces \( 80 \% \) of its previous height on each bounce. (1) When it hits the ground for the \( 8^{\text {th }} \) time, what distance has it travelled? (2) How high off the floor is the ball after the \( 8^{\text {th }} \) bounce? Example 1: Calculate the gravitational force if the mass of the sun is \( 1.99 \times 10^{\wedge} 30 \mathrm{~kg} \) and earth is \( 5.97 \times 10^{\wedge} 24 \mathrm{~kg} \) separated by the distance \( 1.5 \times 10^{\wedge} 11 \mathrm{~m} \) ?(Gravitational constant \( \mathrm{G}=6.673 \times 10^{\wedge}-11 \mathrm{Nm} 2 / \) Kg 2 ) \( \quad \) Edited 19:23 Example 1: Calculate the gravitational force if the mass of the sun is \( 1.99 \times 10^{\wedge} 30 \mathrm{~kg} \) and earth is \( 5.97 \times 10^{\wedge} 24 \mathrm{~kg} \) separated by the distance \( 1.5 \times 10^{\wedge} 11 \mathrm{~m} \) ?(Gravitational constant \( \mathrm{G}=6.673 \times 10^{\wedge}-11 \mathrm{Nm} 2 / \) Kg 2 ) \( \quad \) Edited 19:23 The speed of light is approximately 299,000,000 meters per second. What is the speed of the light, in meters per second, using scientific notation? \( 29.9 \times 10^{7} \) meters per second \( 2.99 \times 10^{8} \) meters per second \( 0.299 \times 10^{9} \) meters per second \( 299 \times 10^{6} \) meters per second (b) A mass \( m \) is held at rest on an inclined plane, whose slope is \( \alpha \), by means of a horizontal force \( F \) (Figure 2.28). If the coefficient of static friction is \( \mu_{s} \), show that the maximum force \( F_{\max } \) allowed before the body starts to move up the plane is given as \( F_{\max }=\frac{m g\left(\sin \alpha+\mu_{s} \cos \alpha\right)}{\cos \alpha-\mu \sin \alpha} \). En speciell balkerie producerar ett som kan halla en vikt pà \( 7 \mathrm{~kg} / \mathrm{mm}^{2} \). Det är tre gânger starkare ãn superlim. Hur stor vikt behövs for att fâ loss en mobiltelefon som har limmats fast i taket? Mobiltelefonen har måtten \( 5,9 \mathrm{~cm}-11,5 \mathrm{~cm} \). Avrunda till hundratal kilogram. A bowling ball is moving down a flat bowling lane at a constant speed. Which statements best describe the movement of this bowling ball? Select all that apply. A. Its movement is caused by unbalanced forces. B. Its movement changes without a force acting upon it. C. Its movement shows Newton's first law of motion. D. Its movement shows Newton's third law of motion. E. Its movement shows Newton's second law of motion. F. Its movement remains the same unless a force acts upon it. A ball rolls down a grassy hill and eventually comes to a stop. Select three of the reasons the ball comes to a stop. A. Friction and drag oppose the motion of the ball. \( \square \) B. There is no force acting to move the ball forward. C. The force of friction against the ball is decreased. D. The forces opposing the ball are unbalanced. \( \square \) E. The force of gravity has increased and stopped the ball. \( \square \) F. There was too much inertia to keep the ball rolling. Which of the following types of energy transfers can take place when matter is not present? A. heat B. conduction C. radiation D. convection
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