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 1 year 1 Answer 220 views

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

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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 1 year 1 Answer 455 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 1 year 1 Answer 199 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 1 year 1 Answer 174 views

How much heavier is the proton compared to the electron?

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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 1 year 1 Answer 155 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 1 year 1 Answer 199 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 1 year 1 Answer 193 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 1 year 1 Answer 154 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 1 year 1 Answer 185 views

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

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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 1 year 1 Answer 185 views

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

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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 1 year 1 Answer 313 views

Physics Newtonian laws?

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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 1 year 1 Answer 175 views

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

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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 1 year 1 Answer 216 views

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

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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 1 year 1 Answer 441 views

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

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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 1 year 1 Answer 416 views

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

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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 1 year 1 Answer 259 views

Physics help?

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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 1 year 1 Answer 194 views

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

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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 1 year 1 Answer 204 views

Physics question on kinetic energy?

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Particle A of mass 500g is moving with a constant velocity of 12m s^-1 towards particle B of mass 1.5kg which is initially at rest. After collision, particle A comes to a rest and particle B moves ...
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General Physics 1 year 1 Answer 691 views

Pivoted Rod with Unequal Masses

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The figure shows a simple model of a seesaw. These consist of a plank/rod of mass mr and length 2x allowed to pivot freely about its center (or central axis), as shown in the diagram. A small sphere of mass m1 is attached to ...
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General Physics 1 year 1 Answer 2150 views

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

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Linear and Rotational Quantities Conceptual Question

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A merry-go-round is rotating at constant angular speed. Two children are riding the merry-go-round: Alan is riding at point A and Isamu is riding at point B.   A) Which child moves with greater magnitude of velocity?   B) Who moves with greater magnitude ...
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General Physics 1 year 1 Answer 890 views

Does fire respond to electromagnetism?

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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 1 year 0 Answers 878 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 1 year 1 Answer 843 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 1 year 1 Answer 773 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 1 year 1 Answer 766 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 1 year 1 Answer 755 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 1 year 1 Answer 754 views

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 1 year 1 Answer 739 views

I’m trying to understand voltage?

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I have understood that voltage is how much energy is carried by the current but say you had current of 10A carrying 20V, does that mean amp of current is carrying 20V or does that mean that the ...
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General Physics 1 year 0 Answers 720 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 1 year 1 Answer 709 views