The weight of an object is (mass) x (gravity).
The weight of Mr. McDonald's object is (112) x (9.8) = <u>1,097.6 newtons</u>.
(about 247 pounds)
That's the force pulling the object down, because it is near the Earth, and
the Earth and the object are attracting each other with forces of gravity.
In order to move the object away from the center of the Earth ("lift" it), a force greater than 1,097.6 newtons must be applied to it <em>in the other direction</em> ... <u>upwards</u>.
<em><u>Any</u></em> force greater than its weight will lift it. The more the upward force exceeds the minimum of 1,097.6 newtons, the faster Mr. McDonald's object will <u>accelerate</u> upwards.
Answer:
To calculate the tension on a rope holding 1 object, multiply the mass and gravitational acceleration of the object. If the object is experiencing any other acceleration, multiply that acceleration by the mass and add it to your first total.
Explanation:
The tension in a given strand of string or rope is a result of the forces pulling on the rope from either end. As a reminder, force = mass × acceleration. Assuming the rope is stretched tightly, any change in acceleration or mass in objects the rope is supporting will cause a change in tension in the rope. Don't forget the constant acceleration due to gravity - even if a system is at rest, its components are subject to this force. We can think of a tension in a given rope as T = (m × g) + (m × a), where "g" is the acceleration due to gravity of any objects the rope is supporting and "a" is any other acceleration on any objects the rope is supporting.[2]
For the purposes of most physics problems, we assume ideal strings - in other words, that our rope, cable, etc. is thin, massless, and can't be stretched or broken.
As an example, let's consider a system where a weight hangs from a wooden beam via a single rope (see picture). Neither the weight nor the rope are moving - the entire system is at rest. Because of this, we know that, for the weight to be held in equilibrium, the tension force must equal the force of gravity on the weight. In other words, Tension (Ft) = Force of gravity (Fg) = m × g.
Assuming a 10 kg weight, then, the tension force is 10 kg × 9.8 m/s2 = 98 Newtons.
Answer:
It depends on the potential energy it has ontop of the ramp. The marble has the same potential energy was the kinetic energy without changing the ramp incline or moving it. What kinetic energy shows is what potential energy made it to be, so we look at how the ramp is placed. If the ramp is a steep incline the kinetic energy will be fast. It depends on the weight of the marble too. If the marble is heavy the potential energy will slowly tansition to kinetic energy while a light marble will transition to kinetic energy fast. But marbles are light so there we have it. It basically goes from potential energy to kinetic energy to thermal energy to potential energy. Make me brainliest pls :)
Explanation:
Answer:
(a)7.5 rad/s2
(b)1.83s
(c)0.03 kgm2
(d)At the outer edge
Explanation:
The moments of inertia of the record table can be calculated as:
(a) If he is pulling with a constant linear acceleration of a= 1.2 m/s2, then the constant angular acceleration is
(b)The time it takes for the child to pull a distance of s = 2m given a = 1.2 m/s2
Then the angular speed the turntable would have achieved by that time is
(c) By the law of conservation in angular momentum:
where I1 is the initial moment of the turn table before spaghetti drop, and I2 is after.
(d) For the same force, the child could generate different amount of torque, depending on where he's pressing his thumb. If it's near the the rotational axis, the moment arm is very small, or not at all, making the torque small. If it's at the edge, then the moment arm is large, making greater torque, so less work.