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
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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
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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? 
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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
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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
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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
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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
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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
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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
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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
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1d

Two forces with magnitudes 33 pound and 74 pounds act on an object at angles of 47° and 132° ,respectively, with the positive x axis. Find the magnitude of the resultant force.

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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
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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?
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1d

A net force of 1.4 Newtons gives an object an acceleration of 1 m/s^2. What force would be required to give the same object an acceleration of 7.5 m/s^2
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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
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1d

A roofer climbs to the top of a church steeple to determine its height. He drops his hammer and observes that it takes 2.0 sec. to strike the ground below. How high is the steeple?
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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
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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
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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
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2d

According to the following balanced reaction, how many grams of NO are formed from 388 grams of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) (Please help Urgent)
Formula: 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
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2d

Automotive air bags inflate when sodium azide, NaN3, rapidly decomposed into N2 and Na by the following reaction: 2 NaN3 --> 2 Na + 3 N2. In order to fill an air bag, 75.0 grams of N2 must be formed.

Question: How many grams of NaN3 must react to form 75.0 grams of N2.
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2d

How many grams of Li3N can be formed from 12.1 grams of Li? Assume an excess of nitrogen (N2). 6 Li(s) + N2(g) → 2 Li3N(s)
Formula: 6 Li(s) + N2(g) → 2 Li3N(s)
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2d

According to the following balanced reaction, how many grams of NO are formed from 388 grams of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g) (Please help Urgent)

Formula: 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)
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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
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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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