11,559 Answered Questions for the topic physics

Physics

3h

Why are the equations of motion valid only when acceleration is constant? Also, why are- dv/dt , ds/dt etc valid in all cases? Don't we consider acceleration constant while deriving them?
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Physics Math Algebra 1

19h

physics homework question
An object moves along the x-axis according to the equation x = 2.95t2 − 2.00t + 3.00, where x is in meters and t is in seconds.a- Determine the instantaneous speed at t = 4.20 s.b-Determine the... more
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Physics Calculus

1d

Find Work Done in Moving Particle
**Show workWhen a particle is located a distance x meters from the origin, a force of cos⁡(pi(x/5)) newtons acts on it.Find the work done in moving the particle from x=2 to x=2.5. ?Find the work... more
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Physics Science

1d

physics homework question
A small mailbag is released from a helicopter that is descending steadily at 1.10 m/s.(a) After 5.00 s, what is the speed of the mailbag?v = ___m/s(b) How far is it below the helicopter?d=... more
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Physics Science

1d

physics homework question
A ball is thrown directly downward with an initial speed of 7.95 m/s, from a height of 30.2 m. After what time interval does it strike the ground?
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Physics

2d

A thin cylindrical shell of radius R1 = 5.5 cm
A thin cylindrical shell of radius R1 = 5.5 cm is surrounded by a second cylindrical shell of radius R2 = 9.0 cm, as in (Figure 1). Both cylinders are 15 mm long and the inner one carries a total... more
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Physics

2d

The archerfish hunt
What is the vertical component of the water's initial velocity? How long does the beetle have to react?How high is the beetle above the fish?What is the horizontal distance between the fish and... more
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Physics

3d

A solid metal sphere of radius 2.50 m carries a total charge of -2.20 μC...
A solid metal sphere of radius 2.50 m carries a total charge of -2.20 μC. (a)What is the magnitude of the electric field at a distance from the sphere's center of 2.60 mm ? (b)What is the magnitude... more
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Physics

3d

How much work done if only half of the rope is pulled to the top of the building?
4. A soft long rope with a weight of 3lb/ft hangs over the edge of a building 200ft high. How much work done if only half of the rope is pulled to the top of the building?
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Physics

3d

How much work is required to pull the entire rope to the top of the building?
3. A soft long rope with a weight of 3lb/ft hangs over the edge of a building 200ft high. How much work is required to pull the entire rope to the top of the building?
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Physics

3d

How much work is done if the density of ice is 917kg/ m^3?
2. A 2 m^3 of ice is pulled up by a chain to 5m high with the weight of the chain to be 1kg/m. How much work is done if the density of ice is 917kg/ m^3?
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Physics

3d

As the crate slides 3.6m, how much work is done on the crate by: a) the worker b) the force of gravity c) the normal force due to the incline plane?

1. To push a 25kg up a 27* inclined plane, a worker exerts a force of 120N parallel to the inclined plane. As the crate slides 3.6m, how much work is done on the crate by: a) the worker b) the... more
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Physics

4d

q1.What is the distance of the fourth leg? q2What is the value of Θ4? q3.What is the value of Dy?
A sailboat race course consists of four legs defined by the displacement vectors A, B, C and D shown above.The values of the angles are Θ1 = 350, Θ2 = 340, and Θ3 = 200.The magnitudes of the first... more
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Physics Algebra 1

4d

physics Homework question
Question: The edges of a shoebox are measured to be 12.3 cm, 18.8 cm, and 29 cm. V= 12.3 x18.8x 29= 6705.96 cm***Determine the volume of the box retaining the proper number of significant figures... more
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4d

Physics homework question
Question: The edges of a shoebox are measured to be 12.3 cm, 18.8 cm, and 29 cm. ***Determine the volume of the box retaining the proper number of significant figures in your answer.)
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4d

physics homework
A small turtle moves at a speed of 651 furlongs per fortnight. Find the speed of the turtle in centimeters per second. Note that 1 furlong = 220 yards and 1 fortnight = 14 days.
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Physics

4d

Loop de loop question
I have an assignment in physics and I can't understand the difference between the 2 questions. That's the questionA skier with mass m=70 kg stands on a ramp of height h. At the foot of the ramp,... more
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Physics Algebra 1

4d

Physics homework question
The speed of light is now defined to be c = 2.99792458 ✕ 108 m/s(a) Express the speed of light to three significant figures. (Enter a number with the correct number of significant figures)(b)... more
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Physics

5d

Physics Cable Magnitude
A 520-N uniform rectangular sign 4.00 m wide and 3.00 m high is suspended from a horizontal, 6.00-m-long, uniform, 110-N rod as indicated in the figure below. The left end of the rod is supported... more
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Physics

6d

Physics Lead Mass
A 24-g ice cube floats in 220 g of water in a 100-g copper cup; all are at a temperature of 0°C. A piece of lead at 86°C is dropped into the cup, and the final equilibrium temperature is 12°C. What... more
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Physics

6d

Physics Fat Metabolism
When you jog, most of the food energy you burn above your basal metabolic rate (BMR) ends up as internal energy that would raise your body temperature if it were not eliminated. The evaporation of... more
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Physics

6d

Physics Length Problem
A steel beam being used in the construction of a skyscraper has a length of 33.000 m when delivered on a cold day at a temperature of 14.000°F. What is the length of the beam when it is being... more
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Physics

6d

Physics Joules Energy
A 46-kg woman cheats on her diet and eats a 580-Calorie (580 kcal) jelly doughnut for breakfast.(a) How many joules of energy are the equivalent of one jelly doughnut?  _________J (b) How many... more
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Physics

6d

Physics Final Pressure
Long-term space missions require reclamation of the oxygen in the carbon dioxide exhaled by the crew. In one method of reclamation, 1.00 mol of carbon dioxide produces 1.00 mol of oxygen, with 1.00... more
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Physics

6d

Physics Beam Length
A steel beam being used in the construction of a skyscraper has a length of 33.000 m when delivered on a cold day at a temperature of 14.000°F. What is the length of the beam when it is being... more
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