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Three forces
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Physics for Scientists and Engineers: Foundations and Connections
- In Fig, a slab of mass m1 =40 kg rests on a frictionless floor, and a block of mass m2 =10kg rests on top of the slab. Between block and slab, the coefficient of static friction is 0.60, and the coefficient of kinetic friction is 0.40. A horizontal force of magnitude 100 N begins to pull directly on the block, as shown. In unit-vector notation, what are the resulting accelerations of (a) the block and (b) the slab?arrow_forwardTwo forces, 1 = (3.90î − 2.60ĵ) N and 2 = (3.65î − 8.05ĵ) N, act on a particle of mass 2.10 kg that is initially at rest at coordinates (+1.60 m, +3.50 m). (a) What are the components of the particle's velocity at t = 11.8 s? = 42.362i−59.826j m/s(b) In what direction is the particle moving at t = 11.8 s?305.302 ° counterclockwise from the +x-axis(c) What displacement does the particle undergo during the first 11.8 s?Δ = ????? m(d) What are the coordinates of the particle at t = 11.8 s? x = ????? y = ?????arrow_forwardAccording to a simplified model of a mammalian heart, at each pulse, approximately 20 g of blood is accelerated from 0.26 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle? Express your answer to two significant figures and include the appropriate units. F= ______ units I got 0.02N but it is wrong.arrow_forward
- The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator? 1.2 m/s^2 downward 2.4 m/s^2 downward 11 m/s^2 upward 1.2 m/s^2 upward 10 m/s^2 upwardarrow_forwardA 3.5 kg particle moves along an x axis according to x(t) = −12 + 5t2 − 4t3, with xin meters and t in seconds. In unit-vector notation, what is the net force acting on theparticle at t = 6 s?arrow_forwardDetermine the magnitude F and direction θ (measured clockwise from the positive y-axis which is downward in this case) that will cause the resultant R of the four applied forces to be directed to the right with a magnitude of 12.4 kN. 12.7 kN, 51.8o 17.2 kN, 15.8o 21.7 kN, 18.5o 72.1 kN, 81.5oarrow_forward
- A man inside the elevator stands in a weighing scale and weighs 120 N when stationary. What will be its apparent weight if the elevator is accelerating downward with a magnitude of 7 m/s^2.a. FN = 53.234 Nb. FN = 69.435 Nc. FN = 34.373 Nd. FN = 45.345 Narrow_forwardThe tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator? a. 11 m/s^2 upward b. 1.2 m/s^2 upward c. 1.2 m/s^2 downward d. 10 m/s^2 upward e. 2.4 m/s^2 downwardarrow_forwardIf a force is applied with a magnitude of 200 N at 30 degrees above the horizontal, what are the horizontal and vertical components of this force? Group of answer choices Fa,h= 136.667 N Fa,v= 87.334 N Fa,h= 200 N Fa,v= 200 N Fa,h= 173.2 N Fa,v= 100 N Fa,h= 150 n Fa,v= 50 Narrow_forward
- A weight of 10 N hangs motionless from a spring. The spring is stretched 0.286 m from its original length. What is the force constant for the spring? 1 2.8 N/m 2 22 N/m 3 35 N/m 4 43 N/marrow_forwardA runner of mass 62.0 kg initially moves at a speed of 8.05 m/s.How long must an average external force of 1.60* 10^2 N act to bring the runner to rest?arrow_forwardAn electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.81 x 105 m/s to a final velocity of 2.69 x 106 m/s while traveling a distance of 0.0663 m. The electron's acceleration is due to two electric forces parallel to the x axis: F1−→F1→ = 9.79 x 10-17 N, and F2−→F2→, which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force F2−→ .arrow_forward
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