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Home Question Bank Physics Archive 2024 November 25

Physics Questions from Nov 25,2024

Browse the Physics Q&A Archive for Nov 25,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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4. Хоккеист с одинаєовой силой ударил: а) по обычной шай- бе; б) по шайбе в десять раз большей, чем первая. Какая из них пройдёт большее расстолние? Почему? 5. На рисунке 50 б тележка массой \( m_{1}=1 \) кг приобрела ско- рость \( v_{1}=0,2 \frac{m}{c} \). Определите скорость второй тележки \( v_{2} \), если её масса \( m_{2}=2 \kappa 2 \). 11. A simple pendulum is built with a string 3 m long. If the pendulum reaches its greatest height 0.5 m above rest level, what is its velocity when potential energy is minimum? H 10. A stone is fired vertically upwards with an initial velocity of \( 30 \mathrm{~ms}^{-1} \). What is the greatest height it reaches? 7. Calculate the kinetic energy of a fly of mass 0.1 g travelling at \( 10 \mathrm{~m} \mathrm{~s}^{-1} \). Use the equations for Newton's second law to understand how mass and force affect the motion of a volleyball. Evaluate Expressions Show your calculations for each probler a. A volleyball is hit and experiences a net force of 2 N , which causes it to accelerate at \( 8 \mathrm{~m} / \mathrm{s}^{2} \). What is the mass of the volleyball? Домашнсе задание 7 класс. 1. Определите сплу тяжести, действующую на автомобиль массой \( \mathrm{m}=1,5 \) т. d) A piece of wire of cross-sectional area \( 4 \mathrm{~mm}^{2} \) has a resistance of 4000 . Find; i) The resistance of a wire of the same length and material if the cross- sectional area is \( 8 \mathrm{~mm}^{3} \); ii) The cross-sectional area of a wire of the same length and material resistance 9000. (4 marks) An object thrown vertically upward from the surface of a celestial body at a velocity of \( 18 \mathrm{~m} / \mathrm{s} \) reaches a height of \( \mathrm{s}=-0.2 \mathrm{t}^{2}+18 \mathrm{t} \) meters in t seconds. a. Determine the velocity v of the object after \( t \) seconds. b. When does the object reach its highest point? c. What is the height of the object at the highest point? d. When does the object strike the ground? e. With what velocity does the object strike the ground? f. On what intervals is the speed increasing? 2.7. What supplies energy in an electric circuit? \( \begin{array}{ll}\text { a) battery } & \text { b) bull wire } \\ \text { c) switch } & \text { d) ammeter }\end{array} \) Una cassa di massa \( m \), partendo da ferma, scende lungo un piano inclinato di \( 30^{\circ} \) rispetto all'orizzontale per un tratto di \( 5,0 \mathrm{~m} \) e poi, dopo un breve tratto orizzontale senza attrito, risale su un secondo piano con la stessa in- clinazione. Se il coefficiente di attrito dinamico tra la cassa e i due piani inclinati è 0,20, calcola la quota che la cassa raggiunge lungo il secondo piano.
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