## How many calories are necessary to change 250 g of ice to water at 20 degree Celsius?

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How many calories are necessary to change 250 g of ice to water at 20 degree Celsius?
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General Physics 2 years 1 Answer 341 views

## 3.8 kilograms of water are changed from ice at 0˚C into liquid water at 0˚C?

Question
3.8 kilograms of water are changed (a) from ice at 0˚C into liquid water at 0˚C (b) from liquid water at 100˚C into steam at 100˚C. For each situation, determine the change in mass ...
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General Physics 2 years 1 Answer 736 views

Question
A metal Sphere has a radius of 3.0 mm and a Mass of 0.96 g. Calculate the volume of the Sphere and then the Density of the metal?
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General Physics 2 years 1 Answer 287 views

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

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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 300 views

## How much heavier is the proton compared to the electron?

Question
How much heavier is the proton compared to the electron? Choose the best answer from the options below: A 10 times B 180 times C 1,000 times D 1,800 times E 2 million times
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General Physics 2 years 1 Answer 260 views

## Is gravity real?

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How are we gonna trust gravity if the guy who made it up,Isaac Newton, died a virgin?
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General Physics 2 years 1 Answer 312 views

## Does a lightning always choose the tallest object to strike?

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If i am standing on a wide plane field, and there is a taller than me object next to me, is it certain that the lightning will strike the taller object rather than me? ...
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General Physics 2 years 1 Answer 322 views

## Why has it proven so hard to find new cutting edge physics beyond the standard model at the LHC?

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Is it more likely to come from gravitational waves and a possible black hole fire wall discovery than the LHC? Will the LHC ever find new physics beyond the standard model?
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General Physics 2 years 1 Answer 229 views

## Is zero gravity a myth?

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Even if you’re in so-called zero gravity you’re really in micro gravity. Only if you’re like trillions of miles from the nearest large body are you actually in zero gravity.
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General Physics 2 years 1 Answer 273 views

## Is there a way to calculate how much calories are burnt when you run?

Question
I want formulas. I know that kinetic energy equals 1/2mv2, could it be calculated with this? Let s say for instance that I run 500 meters in a time 500 seconds. How would I ...
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General Physics 2 years 1 Answer 286 views

## A positive lens with focal point ”f” are used to image an object according to the figure below. For what distances ”a”(expressed in ”f”) can we get with the following characteristics;

Question
A positive lens with focal point ”f” are used to image an object according to the figure below. For what distances ”a”(expressed in ”f”) can we get with the following characteristics; a) Up- and down, smaller and real. b) Upright, enlarged ...
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General Physics 2 years 1 Answer 275 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 244 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 251 views

Question
A metal Sphere has a radius of 3.0 mm and a Mass of 0.96 g. Calculate the volume of the Sphere and then the Density of the metal?
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General Physics 2 years 1 Answer 287 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 1415 views

## What’s the speed of dark?

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I have two thoughts on this. One, the speed of dark is the same as light. two, the speed of dark is infinite and we can’t observe it because it only replaces light as fast as the light ...
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General Physics 2 years 1 Answer 312 views

## At what angle is the airplane climbing?

Question
An airplane is taking off from a runaway with airspeed of 130 km/hr. A car driving at 120 km/hr on the runaway is able to remain just below the airplane. At what angle is the airplane climbing?
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General Physics 2 years 1 Answer 346 views

## Why the earth s megnetic north pole is called north and not south where is actually?

Question
Because, of the compass needle is a magnet and the arrow (red color usually) is the north pole of this magnet can t be attracted from the north pole of the earth but from the south pole of ...
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General Physics 2 years 1 Answer 230 views

## If sun pulls earth..then why didnt earth falls into it?

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I know all would say since earth inst loosing energy as the angle of gravitational force and displacement is tangent i.e 90 degrees and as a consequence of equation work is FDcosø Is zero infacr…but we know orbit ...
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General Physics 2 years 1 Answer 310 views

## A man is laying on a board elevated by a support at the tip of the head of the board and by a scale at the foot of the board.

Question
A man is laying on a board elevated by a support at the tip of the head of the board and by a scale at the foot of the board.  What would happen if a support is placed exactly at ...
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General Physics 2 years 1 Answer 499 views

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

No Questions Found.

## Estimate the pressure exerted on a floor by (a) one pointed heel of area = 0.45 cm2, and (b) one wide heel of area 16 cm2.

Question
Estimate the pressure exerted on a floor by (a) one pointed heel of area = 0.45 cm2, and (b) one wide heel of area 16 cm2. The person wearing the shoes has a mass of 56 kg. Answer is both ...
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General Physics 2 years 1 Answer 1185 views

## If you’re in a diving pool 3 meters deep, why do your ears hurt if you swim to the bottom?

Question
Okay I actually know it’s the density of the water, but you wouldn’t think the pressure difference would be that great in only 3 meters, how great is the pressure difference and do you have a basic ...
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General Physics 2 years 2 Answers 1179 views

## A house at the bottom of a hill is fed by a full tank of water 6.0 m deep and connected to the house

Question
A house at the bottom of a hill is fed by a full tank of water 6.0 m deep and connected to the house by a pipe that is 75 m long at an angle of 61° from the horizontal. ...
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General Physics 2 years 1 Answer 1095 views

## A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis.

Question
A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis. Determine the maximum force which can start the motion of the block.
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General Physics 2 years 1 Answer 1075 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 1053 views

## Does fire respond to electromagnetism?

Question
Fire is plasma. Plasma is ionized gas. Ionized gas is electrified gas. Electrified objects create their own electromagnetic field. So if fire is made of electrified gas, shouldn’t it respond to magnets?
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General Physics 2 years 0 Answers 1047 views

## If the earth stopped spinning would a shadow clock still work? How do you know?

Question
This is a question for my 4th grade son, I would appreciate a short and clear answer.
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General Physics 2 years 1 Answer 1006 views

## When two objects collide and some of the energy is converted to heat does that mean some of the momentum is lost?

Question
I just read that in an impact some energy can be turned into heat instead of transferring momentum. So how fast would the ice cube impact need to be for them to turn into ...
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General Physics 2 years 1 Answer 959 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 959 views

## Projectile Motion and Conservation of Energy Ranking Task

Question
Six baseball throws are shown below. In each case the baseball is thrown at the same initial speed and from the same height H above the ground. Assume that the effects of air resistance are negligible. Rank these throws according to the ...
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General Physics 2 years 1 Answer 957 views