12,762 Answered Questions for the topic physics

Physics Science

07/14/22

calculate the work of electric field force...
Positive charge Q is evenly distributed on a thin ring with a radius of R, the centre of which is point O. Axis OP is pendicular to the plane containing the thin ring. The length of OP is 2R.... more
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Physics Math

07/13/22

How do I find the time taken for A to overtake B? (Details below)
Two particles A and B are moving in the same direction on parallel horizontal tracks. At a certain point, A which is travelling with a speed of 7m/s and accelerating uniformly at 1.5m/s^2 overtakes... more
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Physics

07/13/22

what would be the charge on the vertices of a square with given features ;
If the four vertices of the square ABCD are placed with an equal amount of charge, and thepotential of the intersection of the two diagonal lines of the square is 0, there must be four verticesof... more
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Physics

07/13/22

find the ratio of the light intensity of the transmitted light to the light intensity of the incident light is?
A beam of linear polarized light is perpendicular to a polarizer. Set the vibration direction of the linear polarized light and the transmittance axis of the polarizer at a π/3 angle, then find the... more
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Physics

07/13/22

How is the distance 23m?
Two boxes of mass 30.0 kg and 10.0 kg are at rest side by side (Figure 5). You apply a force of 3.0* 10*2 N on the first box for 5.0 s, and they both slide across the floor. The larger box has a... more
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07/12/22

Interesting tricky physics problem
A spacecraft (with velocity v) moves towards a cloud of cosmic dust of density p2. The dust that hit the spacecraft, sticks to it. Then the engine is turned on, so that the velocity of the... more
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Physics

07/10/22

One particular roundabout has a radius of 40m. What is the maximum speed a 1200 kg car can go around it without skidding if

a) the road is dry and the coefficient of static friction is 0.8b) the road is icy and the coefficient of static friction is 0.2
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Physics

07/10/22

A train has one locomotive and 25 cars. Each of the cars has a mass of 55,000 kg.

The train needs to go up a hill that is angled 1.1 degrees up from the horizontal. What does the mass of the locomotive have to be for it to climb the hill at constant speed? You can assume all the... more
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Physics

07/10/22

Activity of intergration
A barber wants to set up a salon in a room measuring length of 3m by 3m. He has a simple wooden chair, 3 large mirrors and one bulb.Using the knowledge of shadows and reflection, advise the barber... more
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Physics

07/09/22

Electric field from charged plates
Two parallel plates of area5.68*10^-3 m^2 have equal andopposite charges of 4.38*10^-11 Cplaced on them. What is theelectric field between the plates?Could someone please answer this thourghly ?
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07/09/22

Physics problem: rope sliding off the fence
A rope of length l<h is thrown over a fence of height h. Initially, the rope is in equilibrium position. At some moment, the equilibrium is lost and the rope slides off the fence. Find how much... more
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07/09/22

Two balls undergoing an elastic collision
Two balls of masses m1=0.3 kg and m2=0.2 kg are hanging on the same kind of thin threads that are attached to the same point. Keeping the thread tense, the first ball is raised to the height of H=7... more
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07/09/22

Interesting physics problem about a rope attached to an inclined plane
After many attempts, I don't really understand how to solve this physics problem:A rope of lenght l=20 cm is attached to an inclined plane (plane's angle of displacement is α = 30°). The other end... more
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07/09/22

Tricky physics problem about rod touching a box
A light rod of lenght l is attached to the ground A with a movable joint, which is in a perpendicular equilibrium position. On the top of the rod, a sphere of mass m is touching a box of mass M... more
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07/09/22

Physics problem: connected inclined planes
There are two inclined planes with the same curvature and the same mass M put on a horizontal surface. A small body of mass m is set to slide off (without friction) from height h on one plane.... more
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07/08/22

Hard physics problem about object attached to a thread
A thread of lenght l<AB is tied to the top (point A) of the stem AB. The other end of the thread is attached to an object. The thread is stretched out horizontally and then the object is... more
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Physics Calculus

07/07/22

Physics Help Please
A ball is thrown upward with an initial velocity of 48 feet per second from an initial height of 64 feet. The acceleration due to gravity is a(t) = −32 feet per second squared.(a) Find the velocity... more
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Physics

07/07/22

Balance the equation Mg+O2-> MgO
Balancing equations
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Physics

07/07/22

Drug calculations

You have haloperidol injection in 100mg in 2ml.the patient is prescribed 75mg how much suspension would you need to give?
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Physics

07/06/22

How would I solve this practice question?
A person travels 18Km [E], 3 km [E45°N] then 18Km [S]. show that the person's displacement is unaffected by the choice of positive direction?
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Physics

07/06/22

Physics question

A point moves with simple harmonic motion whose period is 4 s. If it starts from restat a distance 4.0 cm from the centre of its path, find the time that elapses before it hasdescribed 2 cm and... more
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Physics

07/05/22

What are the required assumptions/conditions that need to be met in order to apply Bernoulli's equation to a fluid?
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Physics

07/03/22

The car has a mass of 1200 kg
1) The same car reaches a top speed of 15 m/s, then begins braking. It comes to a halt in 20 seconds. Draw a free body diagram of the car and find the force of friction (magnitude and direction)... more
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Physics

07/01/22

Comparing different substances going through the same change in temperature range, how can we tell
Comparing different substances going through the same change in temperature range, how can we tellA. Which substance cools off/warms up faster?B. Which requires more heat?C. Which expands/contracts... more
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Physics

07/01/22

How to produce a larger pressure with the same amount of force
How to produce a larger pressure with the same amount of force
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