4. Matt is at the river and sees a rope swing tied to a tree branch overhanging the water below. As Matt swings out he releases the rope when he is 55 meters about the water. He launches at 25 degrees to the horizontal with an initial velocity \( 14 \mathrm{~m} / \mathrm{s} \). Calculate the following: a. The time while in the air. b. How far he traveled horizontally c. Peak height d. final velocity e. velocity after 0.5 seconds

descreve uma onda estacionária dada pela equação abaixo. Sabendo que o deslocamento está em metros e o tempo em segundos, qual é a densidade linear desta corda? \( \quad y(x, t)=[0,042 \operatorname{sen}(2,0 x)] \cos (30 t) \) \( 0,05 \mathrm{~kg} / \mathrm{m} \) \( 0,88 \mathrm{~kg} / \mathrm{m} \) \( 0,98 \times 10^{\wedge}\{-4\} \mathrm{kg} / \mathrm{m} \) \( 1,6 \times 10^{\wedge}\{-4\} \mathrm{kg} / \mathrm{m} \) \( 4,4 \times 10^{\wedge}\{4\} \mathrm{kg} / \mathrm{m} \)

D The weight of an object is inversely proportional to its mass. 27). What is the best description of the meaning of the 'mass' of an object? A. The space occupied by the object (B) The force that gravity exerts on the object C. The resistance of the object to changes in motion D. the closeness of packing of the molecules in the object 28). On Mars, the acceleration of free fall g is \( 3.7 \mathrm{~m} / \mathrm{s} 2 \). \( \begin{array}{ll}\text { What is the weight of a } 2.0 \mathrm{~kg} \text { mass on Mars? } \\ \text { (A) } 0.54 \mathrm{~N} & \text { B. } 1.9 \mathrm{~N} \text { C. } 7.4 \mathrm{~N} \\ \text { D. } 20 \mathrm{~N}\end{array} \) OUcLes 2022

40 Una motocicletta parte da ferma e raggiunge in \( 10,0 \mathrm{~s} \) la velocità di \( 108 \mathrm{~km} / \mathrm{h} \) accelerando uni- formemente; poi percorre a velocità costante i successivi 2500 m ; infine frena fino ad arrestarsi con accelerazione uguale a \( -4,00 \mathrm{~m} / \mathrm{s}^{2} \). - Disegna il grafico velocità-tempo del moto. - Calcola lo spostamento totale della motocicletta. - Determina la velocità media sull'intero percorso. \( [2,76 \mathrm{~km} ; 27,4 \mathrm{~m} / \mathrm{s}] \)

Câu 10. Một khung dây dẫn dẫn tròn bán kính \( R=10 \mathrm{~cm} \), gồm 2 vòng c cuốn nối tiếp cách điện với nhau, đặt trong không khí có dòng điện không với cuờng độ \( I \). Từ trường do dòng điện trong mỗi vòng dây dẫn gây ra ở tit vòng dây có độ lớn \( \mathrm{B}=4 \cdot 10^{-5} B=5 \cdot 10^{-4} \mathrm{~T} \). Cường độ dòng điện chạy tro mỗi vòng dây dẫn tròn xấp xỉ bằng \( \begin{array}{lll}\text { A. } 9,3 \mathrm{~A} \text {. } & \text { B. } 3,2 \mathrm{~A} & \text { C. } 6,1 \mathrm{~A}\end{array} \)

10 A ball of mass 0.16 kg is moving forwards at a speed of \( 0.50 \mathrm{~m} / \mathrm{s} \). A second ball of mass 0.10 kg is stationary. The first ball strikes the second ball. The second ball moves forwards at a speed of \( 0.50 \mathrm{~m} / \mathrm{s} \). What is the speed of the first ball after the collision? A \( 0.0 \mathrm{~m} / \mathrm{s} \quad \) B \( 0.19 \mathrm{~m} / \mathrm{s} \quad \) C \( 0.31 \mathrm{~m} / \mathrm{s} \quad \) D \( 0.50 \mathrm{~m} / \mathrm{s} \) 11 A mass hangs vertically from a spring. The mass is raised to a point \( P \) and is then released. The mass oscillates repeatedly between point \( P \) and a lower point \( Q \). Which energies alternately increase and decrease throughout the oscillations? A) gravitational potential energy, kinetic energy and elastic energy B gravitational potential energy and kinetic energy only C gravitational potential energy, kinetic energy and internal energy D internal energy and elastic energy