A block of cheese of mass 2.0 kg sits on a freshly waxed, essentially frictionless table. You apply a constant horizontal force of 0.50 N to the cheese. (a) Name the three external forces that act on the cheese and what exerts each force. (b) What is the magnitude of the acceleration of the cheese?
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A block of cheese of mass 2.0 kg sits on a freshly waxed,
essentially frictionless table. You apply a constant horizontal force of
0.50 N to the cheese. (a) Name the three external forces that act on the
cheese and what exerts each force. (b) What is the magnitude of the
acceleration
of the cheese?
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- Two blocks are in contąct on a frictionless table. A horizontal force is applied to the larger block, as shown in the figure. (a) If m, = 2.9 kg, m2 = 1.3 kg, and F = 2.6 N, find the magnitude of the force between the two blocks. (b) Assume instead that a force of the same magnitude Fis applied to the smaller block but in the opposite direction, and calculate the magnitude of the force between the blocks. (Why is the value calculated in (b) not the same as that calculated in (a)?) (a) Number Units (b) Number UnitsRefer to the figure. Let the mass of the block be 8.10 kg and the angle 9 be 25.0°. Find (a) the tension in the cord and (b) the normal force acting on the block. (c) If the cord is cut, find the magnitude of the block's acceleration. (a) Number 33.54 (b) Number 71.94 (c) Number M -4.14 Units N m Units N Frictionless Units m/s^2Four forces act on an object, given by A = 40.3 N east, B = 43.3 N north, C = 74.7 N west, D = 78.7 N south. (Assume east and north are directed along the +x-axis and +y-axis,respectively.) (a) What is the magnitude of the net force (in N) on the object? (b) What is the direction of the force? (Enter your answer in degrees counterclockwise from the +x-axis.)
- A crate is sitting on a horizontal surface where the coefficient of static friction is 0.60. A worker pushes horizontally on the crate, which has a mass of 45 kg. The crate does not move, and there are no other forces acting on it. Which of the following statements is true? (a) The force of friction on the crate is mgμs. (b) The force of friction on the crate is mgμk. (c) The force of friction on the crate is greater than the force that the worker exerts on the crate. (d) The force exerted on the worker by the crate is equal in magnitude to the force of friction exerted by the surface on the crate.Two blocks are in contact on a frictionless table. A horizontal force is applied to the larger block, as shown in the figure. (a) If m1 = 2.4 kg, m2 = 1.6 kg, and F = 3.8 N, find the magnitude of the force between the two blocks. (b) Assume instead that a force of the same magnitude Fis applied to the smaller block but in the opposite direction, and calculate the magnitude of the force between the blocks. (Why is the value calculated in (b) not the same as that calculated in (a)?)When Two forces FA and FB are applied to an object whose mass is 9.15 kg. The larger force is FA. both forces point due east, the object's acceleration has a magnitude of 0.784 m/s². However, when FA points due east and FB points due west, the acceleration is 0.420 m/s², due east. Find (a) the magnitude of FA and (b) the magnitude of FB. (a) Number i (b) Number i Units Units
- Three forces acting on an object are given by F₁ = (-1.951 +5.653) N, F₂ = (4.751 1.351) N, and F3 = (-401) N. The object experiences an acceleration of magnitude 3.90 m/s². (a) What is the direction of the acceleration? (counterclockwise from the +x-axis) (b) What is the mass of the object? kg (c) If the object is initially at rest, what is its speed after 12.0 s? m/s (d) What are the velocity components of the object after 12.0 s? (Let the velocity be denoted by V.) v m/sA cougar bites a llama of mass m and drags it across some rough horizontal ground. The cougar applies a horizontal force of magnitude F, and the llama is dragged at a constant velocity. The coefficient of kinetic friction is μk. While the cougar applies the force F, the magnitude of the kinetic friction force, fk , on the llama obeys: a)F > µk m g > fk b)F = fk = µk m gc)F = fk < µk m gd)cannot answer, not enough information givene) F > fk = µk m gTwo forces FA and FB are applied to an object whose mass is 10.2 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 0.483 m/s². However, when FA points due east and FB points due west, the acceleration is 0.389 m/s², due east. Find (a) the magnitude of FA and (b) the magnitude of FB. (a) Number i (b) Number i eTextbook and Media Save for Later Units Units
- In Figure (a), a constant horizontal force F is applied to block A, which pushes against block B with a 21.0 N force directed horizontally to the right. In Figure (b), the same force is applied to block B; now block A pushes on block B with a 13.0 N force directed horizontally to the left. The blocks have a combined mass of 12.0 kg. What are the magnitudes of (a) their acceleration in Figure (a) and (b) force F. ? (a) Number i (b) Number i A B (a) Units Units BA (b)There are two forces on the 2.26 kg box in the overhead view of the figure but only one is shown. For F₁ = 12.6 N, a = 11.5 m/s², and 0 = 24.4°, find the second force (a) in unit-vector notation and as (b) a magnitude and (c) a direction. (State the direction as a negative angle measured from the +x direction.) (a) Number i (b) Number i (c) Number i + i Units Units F x Ĵ Units î îAn SUV containing 5 passengers has a mass of 3500 kg. It has a driving force of 2500 N directed west on a perfectly horizontal road. The surface of the road exerts a resistive force of 500 N due east. At the same time, a strong wind is blowing a force of 500 N due east in the opposite direction of the car's drive force. Does the car have any acceleration? If yes, then what is the magnitude and direction of the car's acceleration?