The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 800 N as it contracts a distance of 7.6 cm in a 79-kg male. How much work can the biceps muscles (one in each arm) perform in a single contraction? Calculate the amount of energy required to lift a 79-kg person 40 cm in performing a chin-up. J Do you think the biceps muscle is the only muscle involved in performing a chin-up? Yes O No Explain.The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in the figure below. If the spring is compressed a distance of 0.140 m and the gun fired vertically as shown, the gun can launch a 25.0-g projectile from rest to a maximum height of 18.0 m above the starting point of the projectile. b (a) Neglecting all resistive forces, describe the mechanical energy transformations that occur from the time the gun is fired until the projectile reaches its maximum height. This answer has not been graded yet. (b) Neglecting all resistive forces, determine the spring constant. N/m (c) Neglecting all resistive forces, find the speed of the projectile as it moves through the equilibrium position of the spring (where x = 0), as shown in Figure (b). m/s Need Help? Read It Master ItThe system shown in the figure below is used to lift an object of mass m = 24.0 kg. A constant downward force of magnitude F is applied to the loose end of the rope such that the hanging object moves upward at constant speed. Neglecting the masses of the rope and pulleys, find the following. T T T2 (a) Find the required value of F. (b) Find the tensions T1, T2, and T3. (73 indicates the tension in the rope which attaches the pulley to the ceiling.) T 1 = T 2 T 3 = (c) Find the work done by the applied force in raising the object a distance of 2.70 m. KJA 240-g particle on the inside of a smooth hemispherical bowl of radius R = 27.0 cm (see the figure below) is released from point A at rest. Its speed at B is 1.10 m/s. (a) What is its kinetic energy at B? J b) How much mechanical energy is lost as a result of friction as the particle goes from A to B? (c) Is it possible to determine u from these results in a simple manner? Yes O No Explain