When Dr Hewitt cuts the broom right through the center?
When Dr. Hewitt cuts the broom right through the center of gravity, how do the weights of the two sides of the broom compare? The longer side (the handle) has a greater weight than the bristle side. Both sides of the broom on either side of the center of gravity have equal weight.
How does the torque due to the weight of one side of the broom?
The torque due to the weight of the shorter side (the bristles of the broom) is equal in magnitude to the torque due to the weight of the longer side, and opposite in direction.
What happens the first time Dr Hewitt lifts the bowling ball near his teeth and lets go?
What happens the first time Dr. Hewitt lifts the bowling ball near his teeth and lets go? The ball returns to Dr. Hewitt, stopping almost exactly at the point where it was released.
How does the gravity in the space shuttle compare with the gravity on Earth’s surface?
How does the gravity in the Space Shuttle compare with the gravity on Earth's surface? The gravity in the Space Shuttle is approximately equal to the gravity on the surface of the Earth.
Does your ride speed change based on how far from the center of the wheel you are sitting?
At the axis of the rotating platform, you have no tangential speed, but you do have rotational speed. You rotate in one place. As you move away from the center, your tangential speed increases while your rotational speed stays the same. Move out twice as far from the center, and you have twice the tangential speed.
Which position of the broom is easier to rotate?
highest, farthest from your hand. Justification: Because with the heavier weight of the broom father away from your hand, this gives the broom more rotational inertia. This prevents the broom from rotating off your finger as easily, because it has more of the property to resist change.
What do you understand by moment of inertia and torque?
For simple understanding, we can imagine it as Newton's Second Law for rotation. Where torque is the force equivalent, a moment of inertia is mass equivalent and angular acceleration is linear acceleration equivalent. The rotational motion does obey Newton's First law of motion.
Why is moment of inertia important?
The moment of inertia (MOI) is one of the many mass properties that describe an object's stability and the forces needed to alter its motion. For aerospace engineering, stability is a crucial element in designing and manufacturing air and spacecraft.
When Dr Hewitt releases the two projectiles which one hits the ground first?
When Dr. Hewitt releases the two projectiles, which one hits the ground first? Both balls hit the ground at the same time.
How does Dr Hewitt break the piece of wood?
How does Dr. Hewitt break the piece of wood? He causes a change in momentum of his hand over a short period of time.
How far do you have to go to escape Earth gravity?
Wikipedia gives the escape velocity at 9,000 km above the Earth's surface as 7.1 km/s, but as we have seen in other answers, getting to 9,000 km above the surface itself takes a lot of energy, negating the gain from the lower "absolute" speed necessary to break free of the Earth's gravity. Show activity on this post.
At which point of Earth gravity is zero?
The correct answer is At the centre of the Earth. The centre of the Earth is such that if we are at that place, the mass around us can be considered to be condensed at the surface of the Earth itself, i.e considering the Earth as a spherical shell.
Which of the following states in the US would have the greatest tangential speed as the earth rotates on its axis Alaska Texas or Nebraska?
Hawaii has the greatest tangential speed of the 50 states. It is the state that is closest to the Equator, and therefore has the largest radius of revolution.
Does the force that holds the riders on the carnival ride?
When you whirl a can at the end of a string in a circular path, what is the direction of the force that acts on the can? The force is toward the center of the circle. Does the force that holds the riders on the carnival ride in Figure 9.1 act toward or away from the center? Toward the center.
Why is it easier to rotate a broom in vertically?
Since the lever you're opposing this with is your hand, the lever you're using is half the width of your hand, so the force you apply has to be maybe ten times the weight of the broom. Hold it vertically, and the leverage disappears, and all you have to worry about is the broom's weight acting vertically downwards.
What causes the rotary motion of the wheel?
When the motor connected to the ride is supplied with power, the wheel rotates about its central point. Hence, the movement of a Ferris Wheel clearly demonstrates rotatory motion in real life.
Why does torque exist?
Torque is to angular momentum as force is to linear momentum. The "reason torque increases with the moment arm" is that the canonical momentum for the coordinate angle θ has an mR as the prefactor to ˙θ. When we use the angle θ to consider our problem, the relevant mass for point objects is not m, it's mR.
What is moment of inertia in simple terms?
Definition of moment of inertia : a measure of the resistance of a body to angular acceleration about a given axis that is equal to the sum of the products of each element of mass in the body and the square of the element's distance from the axis.
What is moment of inertia in simple words?
Moment of inertia is the measure of the rotational inertia of the body. In simple words, the opposition exhibited by the body to the change in the speed of rotation of the body about the axis due to the applied torque (turning force) acting on the body.
What is moment of inertia for dummies?
0:063:43Moment of Inertia Explained – YouTubeYouTube
Why doesn’t the force of gravity change the speed of a bowling ball as it rolls along a bowling lane?
Why doesn't the force of gravity change the speed of a bowling ball as it rolls along a bowling lane? The force is at a right angle to the motion.
Why didn’t the bowling ball pendulum hit Bill Nye in the face?
Why didn't the bowling ball pendulum hit Bill Nye in the Face? Because kinetic energy will never be more than potential energy.
How much work is done on a 200 kg crate that is hoisted 2 m in a time of 4 s?
PHYSICS TEST 1
| Question | Answer |
|---|---|
| how much work is done on a 100 kg crate that is hoisted 2m in a time of 4s | 100 x 10N = 1000 x 2m = 2000j |
| How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s? | 200 x 10 = 2000 x 2m = 4000/4 = 1000 Watts |
Which principle does Hewitt cite to explain the flight of birds?
This principle is properly known as Galileo's principle of relativity. The author must know this, since it was discussed in sections 3.6 and 4.1 of the book. 22. Near the end of chapter 15 the bird says «In summary – Time dilation: moving clocks run slowly.
Where is the lowest point of gravity on Earth?
Hirt's model pinpoints unexpected locations with more extreme differences. Mount Nevado Huascarán in Peru has the lowest gravitational acceleration, at 9.7639 m/s2, while the highest is at the surface of the Arctic Ocean, at 9.8337 m/s2.
What place has no gravity?
Hoover Dam in Nevada, USA is one such place where gravity doesn't seem to exist at all. Don't believe us? Well then, try this experiment if you ever happen to visit this place. Stand near the dam and pour water from a bottle over the dam.
Where is gravity strongest on Earth?
Using Newton's law of gravity, we find that the force of earth's gravity on your body at the equator is 9.798 m/s2 times the mass of your body, whereas at the poles it is 9.863 m/s2 times the mass of your body.
Which state in the US has the greatest tangential speed as Earth rotates around its axis?
Hawaii has the greatest tangential speed of the 50 states. It is the state that is closest to the Equator, and therefore has the largest radius of revolution.
Which state in the United States has the greatest tangential speed as Earth rotates around its axis Why is this so?
Which state in the US has the greatesty tangential speed as Earth rotates around it axis? Hawaii because its farthest away from the center, and has the greatest tangental speed as the earth rotates.
How many g’s is the Gravitron?
3 g All in all, your body inside a Gravitron is pinned to the wall by forces that feel as strong as 3 g, or three times the normal force of gravity, according to NASA. That force is similar to what astronauts feel as they rocket into space. An astronaut can experience up to 3.2 g's at launch and 1.4 g's upon reentry.