## Math Box: Inverse-Square Relationships

Question
Learning Goal: To understand and use inverse-square relationships. Two quantities have an inverse-square relationship if y is inversely proportional to the square of x. We write the mathematical relationship as y = A/x2. Here, A is a constant. This relationship is sometimes written as
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General Physics 2 years 1 Answer 2462 views

## Normal Force and Centripetal Force Ranking Task

Question
A roller-coaster track has six semicircular “dips” with different radii of curvature. The same roller-coaster cart rides through each dip at a different speed For the different values given for ...
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General Physics 2 years 1 Answer 1561 views

## Two Cars on a Curving Road

Question
A) A small car of mass m and a large car of mass 4m drive along a highway. They approach a curve of radius R. To not slip, both cars need to maintain a net force of F as they travel around the curve. ...
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General Physics 2 years 1 Answer 531 views

## Understanding Newton’s Law of Universal Gravitation

Question
Learning Goal: To understand Newton’s law of universal gravitation and be able to apply it in two-object situations and (collinear) three-object situations; to distinguish between the use of G and g. In ...
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General Physics 2 years 1 Answer 679 views

## Velocity of a Roller Coaster Ranking Task

Question
Six roller-coaster carts pass over the same semicircular “bump.” The mass M of each cart (including passenger) and the normal force n of the track on the cart at the top of each bump are given in the figures. Rank the speeds of ...
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General Physics 2 years 1 Answer 662 views

## A Sculpture in Equilibrium

Question
The abstract sculpture shown in the figure can be placed on a horizontal surface without tipping over. Different parts of the sculpture may be hollow or solid, or made of different materials, but the artist isn’t revealing any such information.
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General Physics 2 years 1 Answer 818 views

## Axis of Rotation and Moment of Inertia Ranking Task

Question
Two identical uniform solid spheres are attached by a solid uniform thin rod, as shown in the figure. The rod lies on a line connecting the ...
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General Physics 2 years 1 Answer 3885 views

Question
A sign is to be hung from the end of a thin pole, and the pole supported by a single cable. Your design firm brainstorms the six scenarios shown below. In scenarios A, B, and D, the cable is attached ...
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General Physics 2 years 1 Answer 5173 views

## Two ladybugs sit on a rotating disk, as shown in the figure (the ladybugs are at rest with respect to the surface of the disk and do not slip). Ladybug 1 is halfway between ladybug 2 and the axis of rotation.

Question
Two ladybugs sit on a rotating disk, as shown in the figure (the ladybugs are at rest with respect to the surface of the disk and do not slip). Ladybug 1 is halfway between ladybug 2 and the axis of ...
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General Physics 2 years 1 Answer 1275 views

## Our Sun rotates about the center of our Galaxy (mG≈4×1041kg) at a distance of about 3×104 light-years

Question
[1ly=(3.00×108m/s)⋅(3.16×107s/yr)⋅(1.00yr)]. What is the period of the Sun’s orbital motion about the center of the Galaxy? Express your answer using one significant figure.
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General Physics 2 years 1 Answer 4929 views

## Was the original (conventional) kilogram a weight of something?

Question
We say kg is for mass and Newton is for weight, but was a kg originally the weight of smt when scientists defined it or could they get gravity out of the picture somehow?
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General Physics 2 years 1 Answer 419 views

## Two Cars on a Curving Road

Question
A) A small car of mass m and a large car of mass 4m drive along a highway. They approach a curve of radius R. To not slip, both cars need to maintain a net force of F as they travel around the curve. ...
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General Physics 2 years 1 Answer 531 views

## Figure one show a car Avening towed at a steady speed up a slope which is inclined at 5 degree to…?

Question
Figure one show a car Avening towed at a steady speed up a slope which is inclined at 5 degree to the horizontal. Assume that the resistive forces acting on car A are negligible. car A has a mass of ...
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General Physics 2 years 1 Answer 443 views

## Physics Newtonian laws?

Question
A rock of mass 2 kg is lifted straight up by a 40 N vertical, applied force. What is the magnitude of the rock’s acceleration? All answers are in ms-2. For this question, use g = 10 ms-2.
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General Physics 2 years 1 Answer 339 views

## Find the acceleration of a car that can go from rest to 150 km/h in 13 s.?

Question
Can someone please help me find the solution to this problem: “Find the acceleration of a car that can go from rest to 150 km/h in 13 s.” I have tried absolutely everything and my online course ...
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General Physics 2 years 1 Answer 428 views

## A 90 kg person is sitting in a boat at rest with a mass of 100 kg?

Question
The person throws a stone of mass 5 kg at 4 m/s horizontally in the north direction. The velocity of the person and the boat after throwing the stone is ? I know it will be on the opposite ...
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General Physics 2 years 1 Answer 688 views

## The froghopper, Philaenus spumarius, holds the world record for insect jumps.

Question
The froghopper, Philaenus spumarius, holds the world record for insect jumps. When leaping at an angle of 58.0 degrees above the horizontal, some of the tiny critters have reached a maximum height of 58.7 cm above the level ground. The ...
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General Physics 2 years 1 Answer 726 views

## The barrel of a rifle has a length of 0.955 m. A bullet leaves the muzzle of a rifle with a speed?

Question
The barrel of a rifle has a length of 0.955 m. A bullet leaves the muzzle of a rifle with a speed of 615 m/s. What is the acceleration of the bullet while in the barrel? A ...
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General Physics 2 years 1 Answer 478 views

## Physics help?

Question
a) What was the lizard’s velocity in the first 2 seconds? b)What was the lizard’s velocity from 2-4 seconds? c) What was the lizard’s velocity from 4-5 seconds? ...
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General Physics 2 years 1 Answer 363 views

## Does Newton’s second law of thermodynamics not disprove macroevolution?

Question
Unless i misunderstood the definition, things naturally go from order to chaos; complexity to simplicity. Macro evolution contradicts of course as you have a simple amoeba or whatever the hell it was, evolving into the complex species ...
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General Physics 2 years 1 Answer 353 views

10. ### Torque Magnitude Ranking Task

No Questions Found.

## How exactly does a newton’s cradle work?

Question
I understand that it has to do with conservation of momentum. But why is it that if you pull one ball back and drop it only the one on the end is affected. Why ...
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General Physics 2 years 1 Answer 309 views

## Does the gravitational force that we experience on a daily on Earth, actually come from Earth? See details?

Question
Or is it rather a force that surrounds objects with mass in space? I watched a video on YouTube about NASA performing an experiment to simulate gravity with the use of inertia, so if gravity can be “created” ...
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General Physics 2 years 1 Answer 308 views

## What would a deadly laser feel like.?

Question
Like a Death Star type laser, I guess. For all intents and purposes, let’s say this would hit in his stomach. Note, this is completely theoretical. I’m writing a Sci-Fi screenplay, and obviously a laser from a ...
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General Physics 2 years 1 Answer 305 views

## UV light from the sun when cloudy?

Question
When i was 9 years old it was a partial sun eclipse but it was very cloudy so couldn’t see it. But i remember me telling my parent and i was convinced i was going to get ...
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General Physics 2 years 1 Answer 303 views

## Apollo: How realistic was the experiment dropping a hammer and feather on the moon?

Question
Good TV – but I always doubted the experimental usefulness. Dropped by hand, with only a TV camera for timing? I imagine a similar experiment on Earth (after Galileo) would use: Equipment to release the items Equipment ...
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General Physics 2 years 1 Answer 302 views

## Physics help?

Question
The position of a particle is given by x = bt – f t^3 where b and f are positive constants. x is in meters, t is in seconds. What are the units of b and f? There ...
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General Physics 2 years 1 Answer 300 views

## Suvat Question?

Question
An aircraft lands on a runway at a velocity of 40 m s-1 and brakes to a halt in a distance of 860 m. Calculate a) the breaking time b) the deceleration of the aircraft
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General Physics 2 years 1 Answer 297 views

## Why do waves have a shorter wavelength in shallower water?

Question
Here’s my very limited and vague answer that really bears not too much detail: The Wave fronts are closer together and since the frequency is constant, and v = f*lambda, if lambda has decreased therefore v has too.
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General Physics 2 years 1 Answer 296 views

## Why is it when we ride in a car with the windows opened the air hits us?

Question
I feel like it’s somewhat related to the Bernoulli’s Principle “an increase in the velocity of a stream of fluid results in a decrease in pressure” So my theory is that a car that moves with a high velocity ...
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General Physics 2 years 1 Answer 294 views

## Physics problem with block attached to rope?

Question
A 1kg block is at rest on the floor while a rope is pulling on it applying a force of 5N at an angle of 30 degrees above the horizontal. What is the magnitude and direction of the normal force ...
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General Physics 2 years 1 Answer 293 views