4,851 Answered Questions for the topic physics

6h

Physics EM induction

A pair of parallel conducting rails that are L = 22 cm apart lies at right angles to a uniform magnetic field of 0.5 T directed into the page. A R = 14  resistor is connected across the rails. A... more

6h

Physics Problem

The 400-turn primary coil of a step-down transformer is connected to an ac line that is 120 V (rms). The secondary coil is to supply 15.0 A at 6.30 V (rms).1)Assuming no power loss in the... more

6h

Physics Current

An ideal transformer produces an output voltage that is 500% larger (e.g. a 6-fold increase) than the input voltage.If the input current is 14 A (rms), what is the output current? 

6h

Physics Problem

The 400-turn primary coil of a step-down transformer is connected to an ac line that is 120 V (rms). The secondary coil voltage is 6.50 V (rms).Calculate the number of turns in the secondary coil

6h

Physics EM current

A square, 45-turn coil 10.0 cm on a side with a resistance of 0.720  is placed between the poles of a large electromagnet. The electromagnet produces a constant, uniform magnetic field of 0.600 T... more

6h

Physics Induction

A single-turn circular loop of wire that has a radius of 2.5 cm lies in the plane perpendicular to a spatially uniform magnetic field. During a 0.12-s time interval, the magnitude of the field... more

13h

You are pushing a large box across a frictionless.....(IN THE DESCRIPTION)

You are pushing a large box across a frictionless floor by applying a constant horizontal force. If the box starts at rest, you have to do work W_1 in order for the box to travel a distance d in... more

1d

After a person throws a ball, the ball leaves their hand and has an initial velocity of 8m/s.

The ball is in the direction of pi/6 above the horizontal, and a height of 1.5 meters above the ground. Construct parametric equations for the path of the ball. Be sure to include the domain of... more

1d

Your physics book is resting in front of you on a horizontal table in the campus library. You push the book over to your friend,...... (IN THE DESCRIPTION)

Your physics book is resting in front of you on a horizontal table in the campus library. You push the book over to your friend, who is seated at the other side of the table, 0.400 m m north and... more

1d

physics friction and acceleration

a car of mass 1000kg is traveling at a speed of 45m/s at the top of a 25 degrees incline. The surface of the incline has uk= 0.3 Find work done by gravity as a car moves tot the bottom of the... more

1d

Physics- Electric Field Question

Can you help me to solve the problem ?Positive charge uniformly distributed over an infinite flat horizontal sheet, such as a very large sheet of paper. Suppose that the amount of charge per unit... more

1d

what is the force applied by the child?

A child pulls a 19.2 kg wagon across a level floor, causing it to accelerate at 2.7 m/s2. If the force of friction between the wheels and the wagon is 9.1 N, what is the force applied by the child?

1d

How much force do the students need to exert (combined) if they want to give the car a forward acceleration of 0.5 m/s2

Two students are pushing a stalled car down the street. The car has a mass of 1500 kg and experiences a friction force between the tires and the road of 350 N. How much force do the students need... more

1d

A pitcher throws a baseball from a height of 2.5 meters with a velocity of 21 m/s. How long before the ball hits the ground? How far will the ball travel?

Free Fall Kinematic Equations which may help with this problem.Vf=Vi + 9.8*t d=Vi*t + .5*9.8*t2 Vf2 = Vi2 + 2*9.8*d d= [Vi + Vf]*t/2

1d

Neglecting the effects of air resistance, how far will an object fall from rest in 9 seconds? Please show your work in order to earn credit for this question.

Vf=Vi + 9.8*t d=Vi*t + .5*9.8*t2 Vf2 = Vi2 + 2*9.8*d d= [Vi + Vf]*t/2

1d

What is the net force acting on the block?

A 10 kg block experiences two external forces acting on it simultaneously. Force A has a magnitude of 29 N and points in the positive direction. Force B has a magnitude of 20 N and points in the... more

2d

Were the incident rays parallel, converging, or diverging prior to striking the mirror?

Light is observed to converge to a point after being reflected from a plane mirror. Were the incident rays parallel, converging, or diverging prior to striking the mirror? How would you figure this... more

2d

Newton’s third law and conservation of momentum

When a bird flies, it’s wings push air downward. As a result the air pushed back upward on the bird, which law of motion most applies to the way the wings of a bird beat?
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