12,762 Answered Questions for the topic physics

Physics

05/30/23

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

05/30/23

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

05/30/23

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

05/30/23

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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Physics

05/30/23

Physics Speed Question
1.10 kg solid, ball of radius 0.140 m is released from rest at point A, its center of gravity a distance of 1.70 m above the ground. The ball rolls w/o slipping to the bottom of an incline and back... more
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Physics

05/30/23

Physics question!! (please help)
The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is a 23.0 N block hanging from the 80 cm mark. Decide where each of the... more
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Physics

05/29/23

how much does the ball clear or not clear the crossbar
a kicker needs to kick a football 36 meters away from the field goal.The ball must clear the 5.5 meter high crossbar. It is kicked traveling at a speed of 22 m/s at a 55° angle. 
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Physics

05/28/23

elements of physics 101
On aircraft carriers, catapults are used to accelerate jet aircraft to flight speeds in a short distance. One such catapult takes a 17,500-kg jet from 0 to 67 m/s in 2.9 s. (Assume the catapult... more
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05/27/23

What is n_i, using semiconductor w/ electron and hole carrier mobility?
If a semiconductor has 500(Ω-m)-1, with electron carrier mobility of 1.6 x 10-1 m2/V-s and hole carrier mobility of 7.5 x 10-2 m2/V-s, what is ni?
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05/25/23

Solve the velocity field of a rigid sphere falling under gravity within a larger sphere
A rigid sphere of radius R1 is falling at a velocity Ui under the action of gravity gi within a larger stationary hollow sphere of radius Ro. The inner sphere is at an instant in time centered on... more
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05/25/23

Calculating the velocity field around a rigid sphere under creeping flow conditions
A Rigid sphere is placed at the origin in the undisturbed linear flow ui∞=Eijxj +Ωijxj where Eij and Ωij are the constant rate of strain and vorticity tensors respectively. Assume the sphere is... more
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Physics

05/23/23

At each corner of a square of side ℓ t..
At each corner of a square of side ℓ there are positive point charges of magnitudes Q1=Q, Q2=8Q, Q3=9Q and Q4=6Q. a.) Determine the magnitude of the force on the charge Q2. b.) Determine the angle... more
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Physics

05/22/23

Tutor was not a match for the material
Hello,Please advise. My son scheduled a tutor session for a college physics assignment for 1:00 today. Within the first half hour he realized this was not a good match. The tutor spent 20 minutes... more
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Physics

05/22/23

a 70.0 kg ice skater standing still on frictionless ice throws a 7.0 kg bowling ball horizonatlly forward at a speed of 20.0 m/s. At what magnitude velocity does the skater move backward?
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Physics

05/21/23

Physics question
A 6.000 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is 𝜇s=0.655 and the coefficient of kinetic friction is 𝜇k=0.205. At time 𝑡=0, a... more
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Physics

05/21/23

HELP ME WITH PHYSICS!!!
A mop is pushed across the floor with a force 𝐹 of 40.8 N at an angle of 𝜃=51.2∘. The mass of the mop head is 𝑚=2.10 kg. Calculate the magnitude of the acceleration 𝑎of the mop head if the... more
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Physics

05/21/23

A car is moving across a level highway with a speed of 29.4 m/s. The brakes are applied and the wheels become locked as the 1260-kg car skids to a stop. The braking distance is 135 meters.
a.) What is the initial kinetic energy of the car?b.) What is the final final energy of the car?c.) How much work was done by the brakes to stop the car? d.) Determine the magnitude (enter your... more
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Physics

05/21/23

If the distance from a point source of sound is tripled, by what factor does the sound intensity decrease? Assume there are no reflections from nearby objects to affect your results.
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Physics

05/21/23

A stereo speaker represented by P in Figure 13-22 emits sound waves with a power output of 130.0 W. What is the intensity of the sound waves at point x when r = 6.0 m?
Figure 13-22
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Physics

05/21/23

A 90 kg woman jumps from a ledge that is 1.4 m above concrete and prepares to become internet famous.
(a) What is her speed just before her feet strike the pavement?(b) The only cushion for her feet is the 0.50 cm in the pads of her feet. So, she displaces only 0.50 cm during the landing. Calculate... more
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Physics

05/21/23

A person lifts a 6.5 kg box of bricks a vertical distance of 1.20 m and then carries the box horizontally a distance of 13.30 m.
(a) How much work is done by the person in the process?(b) How much work is done by gravity in the process?
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Physics

05/21/23

Physics question
A planet emits visible color at 600nm. If the planet is moving away from a stationary observer, which of the following cannot be the wavelength observed?
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Physics

05/21/23

Physics question
A planet emits visible color at 600nm. If the planet is moving away from a stationary observer, which of the following cannot be the wavelength observed?
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05/19/23

design a feedback controller

A mass-spring-damper system is shown. The input is a force, u, acting on the mass block. The output is displacement, y, of the mass block. Using the well-known Newton’s second law, the dynamic... more
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Physics

05/18/23

A boat takes 3.0 h to travel 27 km down a river, then 6.0 h to return. How fast is the river flowing in km?
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