Open Question
A constant force is applied to an object, causing the object to accelerate at 10 m/s². What will the acceleration be ifd. The force is halved and the object's mass is doubled?
6. Intro to Forces (Dynamics)
Newton's First & Second Laws
Back6. Intro to Forces (Dynamics)
Newton's First & Second Laws
- Open QuestionA constant force is applied to an object, causing the object to accelerate at 10 m/s². What will the acceleration be ifa. The force is halved?
- Open QuestionA single force with x-component Fₓ acts on a 2.0 kg object as it moves along the x-axis. A graph of Fₓ versus t is shown in FIGURE P5.32. Draw an acceleration graph aₓ versus t) for this object.
- Open QuestionA single force with x-component Fₓ acts on a 500 g object as it moves along the x-axis. The object's acceleration graph aₓ versus t) is shown in FIGURE P5.30. Draw a graph of Fₓ versus t.
- Open QuestionThe 100 kg block in FIGURE EX7.24 takes 6.0 s to reach the floor after being released from rest. What is the mass of the block on the left? The pulley is massless and frictionless.
- Open QuestionTwo blocks are attached to opposite ends of a massless rope that goes over a massless, frictionless, stationary pulley. One of the blocks, with a mass of 6.0 kg, accelerates downward at 3/4g. What is the mass of the other block?
- Open Question
(II) A 27-kg chandelier hangs from a ceiling on a vertical 3.4-m-long wire.
(a) What horizontal force would be necessary to displace its position 0.15 m to one side?
- Open Question
(II) A 27-kg chandelier hangs from a ceiling on a vertical 3.4-m-long wire.
(b) What will be the tension in the wire?
- Open Question
II) According to a simplified model of a mammalian heart, at each pulse approximately 20 g of blood is accelerated from 0.25 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?
- Open Question
(III) A person jumps from the roof of a house 2.8 m high. When he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. If the mass of his torso (excluding legs) is 42 kg, find
(b) the average force exerted on his torso by his legs during deceleration.
- Open Question
(II) An object is hanging by a string from your rearview mirror. While you are accelerating at a constant rate from rest to 28 m/s in 5.0 s, what angle θ does the string make with the vertical? See Fig. 4–46.
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- Open Question
A package of mass m is placed onto a horizontal conveyor belt moving at speed v (Fig. 7–32). The coefficient of kinetic friction between package and belt is μₖ .
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(a) How long does it take the package to stop sliding on the belt? [Hint: Use F = ma.]
- Open Question
(II) A 3.0-kg object has the following two forces acting on it:
→
F₁ = (16î + 12ĵ) N
→
F ₂ = ( -10î + 22ĵ) N
If the object is initially at rest, determine its velocity v→ at t = 4.0s .