For A = 7i + -6j + 10k, B = -5i + 6j + -7k, and C = -2i + 1j + -8k, find C . (A-B). Submit Answer Tries 0/10 1a. A 15.5kg block is dragged over a rough, horizontal surface by a 74.7N force acting at 19.8 degrees above the horizontal. The block is displaced 4.54m, and the coefficient friction is 0.298. Find the work done by the 74.7N force. Submit Answer Tries 0/10 1b. Find the work done by the normal force. Submit Answer | Tries 0/10 c. What work does the gravitational force do on the block? Submit Answer Tries 0/10 1d. How much energy is lost due to friction? Submit Answer Tries 0/10 le. Find the total change in the block's kinetic energy. Submit Answer | Tries 0/10 of 3. Calculate the scalar product of the vectors in the figure below. Assume 01 = 109 , 02 = 120 , F = 38.9N and v = 17.4cm/s. Submit Answer Tries 0/10 A force F = (4.34x i + 2.75y j)N, where x and y are in metres, acts on an object as it moves in the x direction from the origin to x = 5.56m. Calculate the work done on the the force. Submit Answer | Tries 0/10 4a. When a 4.39kg mass is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.62cm. If the 4.39kg mass is removed how far will the sprin a 1.60kg is hung on it instead? Submit Answer Tries 0/10 4b. How much work must an external agent do to stretch the spring 3.97cm from its unstretched position? Submit Answer Tries 0/10 If it takes 4.92] of work to stretch a Hooke's law spring 15.0cm from its unstressed length, determine the extra work required to stretch it an additional 10.0cm. Submit Answer Tries 0/10 6a. A 158g block is pressed against a spring of force constant 1.47kN/m until the block compresses the spring 12.0cm. The spring rests at the bottom of a ramp inclined at 57 horizontal. Using energy considerations, determine how far up the incline the block moves before it stops if there is no friction between the block and the ramp. Submit Answer | Tries 0/10 6b. How far up the incline does the block move before it stops if the coefficient of kinetic friction is 0.420? Submit Answer Tries 0/10 A constant torque of 23.2Nm is applied to a grindstone whose moment of inertia is 0.130kg.m . Using energy principles, calculate the angular speed (in revolutions per second grindstone has made 19.0 revolutions. (Neglect friction. ) Do not enter units. Submit Answer | Tries 0/10 A long, thin uniform rod of length 1.67m and mass 3.87kg is pivoted about a horizontal, frictionless pin passing through one end. The rod is released from one end in the verti position. Pivot At the instant the rod is horizontal, find its angular speed. Submit Answer | Tries 0/10 At the instant the rod is horizontal, what is its angluar acceleration? Submit Answer | Tries 0/10 At the instant the rod is horizontal, what is the magnitude of its x-component of acceleration at its centre of mass? Submit Answer Tries 0/10 At the instant the rod is horizontal, what is the magnitude of its Y-component of acceleration at its centre of mass? Submit Answer Tries 0/10 The top shown in the figure below has a moment of inertia of 3.50E-4kg.m and is initially at rest. It is free to rotate about the stationary axis AA'. A string, wrapped around a the axis of the top is pulled in such a manner that a constant tension of 5.26N is maintained. If the string does not slip while it is unwound from the peg, what is the angular the top after 73.2cm of string has been pulled off the peg? Submit Answer Tries 0/10 A 5.00kg particle moving along the x-axis experiences the force shown, where Fmax = 4.89N, Fmin = -4.89N, dj = 4.42m, d2 = 8.84m, d3 = 13.26m, and d4 = 17.68m. At x the particle's velocity is 3.35m/s. F(N) d , d2 da - x (m) Fmin What is its velocity at x=8.84m? Submit Answer Tries 0/10 What is its velocity at x=17.68m? Submit Answer Tries 0/10 (10)(a) How much work does an elevator motor do to lift a 1394.0 kg elevator a height of 69.3 m? Submit Answer Tries 0/10 (b) How much power must the motor supply to do this in 35.8 s at constant speed? Submit Answer Tries 0/10 3) A horizontal spring with spring constant 69.3N/m is compressed 49.6cm and used to launch a 7.16kg box across a frictionless, horizontal surface. After the box travels son distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is 0.232. How far does the box slide across the rough surface before stopping? Subm s 0/10