it is said that a fool and his money ate soon parted.Suppose we place the fool and gold brick in the middle of a frictionless,frozen lake (Galileo's ideal frozen lake).How can the fool rescue himself?Is he still a fool?
Answers
Answer 1
Answer:
He could theoretically push the gold brick away from himself, and due to Newton's 3rd law (Every action has an equal and opposite reaction), the same amount of force would recoil back at him from the gold brick. As a result, he will move in the opposite direction from the gold brick, and since it as an ideal frozen lake (meaning there is no friction present), he will keep going until he reaches the edge of the lake.
And I don't know if he's still a fool. That's up to you.
How did Marie Curie’s research in radioactivity benefit others while harming her
Answers
The discoveries Mme Curie made were of great benefit to physics, chemistry and medicine. During the time she was doing her research, the health effects of ionizing radiation were not known. The amount of radiation that she was exposed to led to her death. Even today her notebooks and other personal effects are highly contaminated with radioactive material.
In Act III, Scene 1, who hears these words from Titania?Thou art as wise as thou art beautiful. A. Puck B. Oberon C. Bottom D. Peaseblossom
Answers
C. Bottom
Titania speaks these words as she is under the enchantment of the magic flower, it makes her fall in love with the first thing she sees. It's comedic because Bottom is also enchanted to have the head of a donkey, so she's claiming that this peasant with a donkey head is both wise and beautiful. The reality being that he is as wise as he is beautiful, in that he is neither beautiful nor wise.
If you had two forces, one with a magnitude of 25 N and the the other with a magnitude of 100 N, what would be the maximum net force these forces could exert on an object?
Answers
The maximum occurs when both of those forces push on an object in the same direction. Then, the net force on the object is 125 N.
One of the things he was bothered by was the long-held belief of Aristotle thatobjects, including the Earth, naturally come to rest unlessthey are forced to move byan external force(the motion of the other planets was considered special– they had theproperty ofquintessenceso that their natural state was to move in circles). One thingthat bothered Copernicus is that nobody could imagine a force large enough to keep theEarth moving around the Sun. Galileo and Newton understood that objects had inertia–that they tended to keep moving in a straight line at constantspeed (or sit still) unlessacted on by an external force– in the cases of objects ‘naturally’ coming to rest, frictionwas identified as the responsible force. So for the Earth, there doesn’t need to be anexternal force to keep it moving, just so long as it isn’t being affected by friction. As wewill learn in subsequent chapters, gravity is what keeps theEarth moving in an ellipsearound the Sun rather than just moving through space in a straight line.
A child slides down a slide on the playground and her hair starts to stand on end. What happened?
Answers
It's static electricity from sliding down. Whenever a person goes fast on something, (say a roller coaster/slide/etc...) their hair gets filled with static electricity. Have a good day! :3
possibly static electricity, I'm not so sure you should rely on my answer, but it's a guess.
A Boy throws a pebble into the center of the pond. A floating leaf near the waters edge oscillates ( moves up and down ) two complete cycles in one second as water waves move past the leaf. The waters wavelength is 10 meters. What is the waves velocity?
Answers
Wave speed = (wavelength) x (frequency)
= (10 m) x (2 / sec) = 20 m/s.
By the way . . . The water doesn't move past the leaf. Only the wave does.
A crane has an arm length of 20m inclined at 30deg with the vertical. It carries a container of mass of 1 ton suspended from the top end of the arm. Find the torque produced by the gravitational force on the container about the point where the arm is fixed to the crane. Given: 1 ton = 1000 kg; neglect the weight of the arm. Hint: take the force and perpendicular distance from the point where the arm is fixed to the crane. Note: Express your answer in whole number. No unit is required for the final answer. Set your calculator in radians.
Answers
To find the torque produced by the gravitational force on the container, we need to calculate the force and perpendicular distance from the point where the arm is fixed to the crane.
First, let's calculate the force exerted by the gravitational force on the container. The weight of the container can be calculated using its mass and the acceleration due to gravity. Given that the mass of the container is 1000 kg (1 ton) and the acceleration due to gravity is approximately 9.8 m/s^2, we can calculate the force as follows:
Force = mass * acceleration due to gravity Force = 1000 kg * 9.8 m/s^2 Force = 9800 N
Next, we need to find the perpendicular distance from the point where the arm is fixed to the crane to the line of action of the gravitational force. This distance can be determined using trigonometry.
The perpendicular distance can be calculated using the formula:
Perpendicular distance = arm length * sin(angle)
Given that the arm length is 20 m and the angle with the vertical is 30 degrees, we can calculate the perpendicular distance as follows:
Perpendicular distance = 20 m * sin(30 degrees) Perpendicular distance = 20 m * 0.5 Perpendicular distance = 10 m
Now, we can calculate the torque using the formula:
Torque = force * perpendicular distance
Substituting the values we calculated earlier:
Torque = 9800 N * 10 m Torque = 98000 Nm
Therefore, the torque produced by the gravitational force on the container about the point where the arm is fixed to the crane is 98000 Nm.