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Hogar Banco de preguntas Física Archive 2025 January 06

Physics Questions from Jan 06,2025

Browse the Physics Q&A Archive for Jan 06,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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E12. A ball rolls off a shelf with a horizontal velocity of \( 3 \mathrm{~m} / \mathrm{s} \). At what horizontal distance from the shelf does the ball land if it takes 0.45 second to reach the floor? Calculating wave speed 1 The wavelength of a wave in the ocean is 10 n every 2 s , calculate the wave speed. 2 Waves with a frequency of 2 Hz are generated is \( 0,4 \mathrm{~m} \). Calculate the wave speed. Transverse waves have a speed of \( 0,5 \mathrm{~m} \cdot \mathrm{~s}^{-1} \) anc a) Calculate the frequency of the waves. b) What is the period of the waves? A boy on a harbour wall watches the sea wave times the waves and finds that a crest moves p The distance between 5 crests is 40 m . a) What is the frequency of the waves? b) What is the wavelength of the waves? c) Calculate the wave snood E11. A bullet is fired horizontally with an initial velocity of \( 800 \mathrm{~m} / \mathrm{s} \) at a target located 200 m from the rifle. a. How much time is required for the bullet to reach the target? b. Using the approximate value of \( g=10 \mathrm{~m} / \mathrm{s}^{2} \), how far does the bullet fall in this time? EA A ball is thrown upward, from the ground, with an initial velocity of \( 13 \mathrm{~m} / \mathrm{s} \). Using the approximate value of \( g=10 \mathrm{~m} / \mathrm{s}^{2} \), what are the magnitude and direction of the ball's velocity (see example box 3.3 ) a. 1 second after it is thrown? b. 2 seconds after it is thrown? 28. How high above the ground is the ball in exercise 7 a. 1 second after it is thrown? b. 2 seconds after it is thrown? (194) A body of weight (W) gm.wt. is placed on a horizontal rough plane. A horizontal force of magnitude \( 100 \mathrm{gm} . \mathrm{wt} \) acts on it. It makes it about to move. The plane has been tilte \( 45^{\circ} \) to the horizontal and a force of magnitude \( 150 \sqrt{2} \) gm.wt. acts on the body in direction of the line of greatest slope up the body now is about to slide, then The coefficient of statiof fiction between the body and theglame = ....... (a) \( \frac{1}{2} \) (b) \( \frac{3}{4} \) (c) \( \frac{1}{3} \) (d) \( \frac{1}{4} \) Final Revision - Sec 2 (194) A body of weight (W) gm. Wt. is placed on a horizontal rough plane. A horizontal force of magnitude \( 100 \mathrm{gm.wt} \) acts on it. It makes it about to move. The plane has been tilte \( 45^{\circ} \) to the horizontal and a force of magnitude \( 150 \sqrt{2} \) gm.wt. acts on the body in direction of the line of greatest slope up the body now is about to slide, then The coefficient of statieffiction between the body and thenlaune = 3. An electron jumps from one energy to another in an atom radiating \( 9.0 \times 10-19 \mathrm{~J} \) If h equals \( 6.6 \times 10-34 \mathrm{~J} \) and c is equal to \( 3.0 \times 10-8 \mathrm{~ms} \) what is the wavelength of the radiation? E7. A ball is thrown upward, from the ground, with an initial velocity of \( 13 \mathrm{~m} / \mathrm{s} \). Using the approximate value of \( g=10 \mathrm{~m} / \mathrm{s}^{2} \), what are the magnitude and direction of the ball's velocity (see example box 3.3 ) a. 1 second after it is thrown? b. 2 seconds after it is thrown? E5. A ball is thrown downward with an initial velocity of \( 14 \mathrm{~m} / \mathrm{s} \). Using the approximate value of \( g=10 \mathrm{~m} / \mathrm{s}^{2} \), what is the velocity of the ball 3.0 seconds after it is released? (See example box 3.2.)
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