A pool cue with a speed of 2.30 m/s strikes a stationary white ball. The pool cue is 53.0% efficient at transferring kinetic energy from itself to the white ball. The speed of the white ball immediately after being struck is
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- Problem 2. A 4.0 kg object moving with an initial velocity of 8.0 m/s on a horizontal surface comes torest due to friction after it travels a distance of 10.0 m.(a) What is the increase of thermal energy caused by friction? Take g = 9.8 m/s2.(b)What is the coefficient of kinetic friction between the object and the surface?If you have a ball with a mass of 6.00kg, that has an initial velocity of vA=(2.00i + 5.00j)m/s and a final velocity of vB=(-2.00i + 8.00j)m/s, If the Work done only changes the kinetic energy, what is the average force applied on the ball, if the force is exerted for 3.50 seconds? a. (-2.83i + 3.61j) N b. (-6.81i + 5.14j) N c. (0.00i + 13.0j) N d. (-4.00i + 3.00j) NA 4 kg object is fired straight up with an initial speed of 80 m/s. Ignore air resistance and set the initial height of the object at zero. Use g = 10m/s/s. Find the total energy. Find the height of the object when its speed is 40 m/s. Find the speed of the object when its height is 200 m.
- The drawing shows a bowling ball suspended from the ceiling of a classroom by a strong cord. The ball is drawn away from its equilibrium position and released from rest at the tip of a student's nose. The student remains stationary. After one swing when the ball returns toward the student, will it hit the student's nose? O No, because air resistance will remove some of the ball's kinetic energy, so ball will reach slightly lower. O Yes, because after one swing it returns even higher than it started. O Impossible to determine without knowing the height of the student's nose.In the figure, a block of mass m = 4.00 kg slides head on into a spring of spring constant k = 230 N/m. When the block stops, it has compressed the spring by 8.40 cm. The coefficient of kinetic friction between block and floor is 0.480. While the block is in contact with the spring and being brought to rest, what are (a) the work done by the spring force and (b) the increase in thermal energy of the block-floor system? (c) What is the block's speed just as the block reaches the spring? (a) Number -0.81 (b) Number 1.6 (c) Number i -1.1 Units J Units J Units m/sA 68.5-kg athlete leaps straight up into the air from a trampoline with an initial speed of 8.7 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. (a) What are the interacting objects and how do they interact? (b) Select the height at which the athlete's speed is 8.7 m/s as y = 0. What is her kinetic energy at this point? What is the gravitational potential energy associated with the athlete? (c) What is her kinetic energy at maximum height? What is the gravitational potential energy associated with the athlete? (d) Write a general equation for energy conservation in this case and solve for the maximum height. Substitute and obtain a numerical answer. m (e) Write the general equation for energy conservation and solve for the velocity at half the maximum height. Substitute and obtain a numerical answer. m/s
- Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown in the figure below. The monument is made from tens of thousands of small stone blocks of density 3 293 kg/m. The monument is 14.0 m high and 64.0 m wide at its base and is everywhere 2.50 m thick from front to back. Before the monument was built many years ago, all the stone blocks lay on the ground. How much work did laborers do on the blocks to put them in position while building the entire monument? Note: The gravitational potential energy of an object-Earth system is given by U, = Mgy CM, where M is the total mass of the object and yCM is the elevation of its center of mass above the chosen reference level.A 100 kg object is fired straight up with an initial speed of 200 m/s. Ignore air resistance and set the initial height of the object at zero. Use g = 10m/s/s. Find the total energy of the object. Find the height of the object when its speed is 100 m/s. Find the speed of the object when its height is 100 m. Find the maximum height of the object.Timmy is sat down in class, looking around the room. He notices a water bottle on a desk next to him and thinks to himself that since the water bottle is on the desk it must not have kinetic energy. Is he right yes, or no? Explain?
- A 71.1-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.59 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy?A child throws a stone upwards. While the stone is moving upwards the gravitational force does positive work on it and the gravitational potential energy increases. the gravitational force does positive work on it and the gravitational potential energy decreases. the gravitational force does negative work on it and the gravitational potential energy increases. O the gravitational force does negative work on it and the gravitational potential energy decreases.An airplane of mass 4500 kg is cruising at a speed of 49.0 m/s at an altitude of 175 m. What is its total mechanical energy ? Show solution and choose from the choices below: 2.27 × 10^8 J 6.91 × 10^7 J 5.26 × 10^7 J 3.91 × 10^7 J 1.31 × 10^7 J