# Physics Homework Help

eNotes Homework Help is a way for educators to help students understand their school work. Our experts are here to answer your toughest academic questions! Once it’s posted to our site, your question could help thousands of other students.

• Physics
An object is traveling in uniform motion when its velocity is constant. This means that the object is neither accelerating nor decelerating. When an object's velocity is constant, it is moving only...

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• Physics
The crate is a cube with sides 1 m and has a mass of 29 kg. It rests on the floor with the coefficient of static friction between the floor and the crate being 0.53. A horizontal force is being...

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• Physics
The crate is to be pushed across a horizontal surface and the force required to get it moving is 56 N. The crate has a mass of 21369 g. The coefficient of friction between the create and the...

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• Physics
The sled placed on ice has a mass of 76 kg and a volume of 1.25 m^3. The coefficient of kinetic friction between the ice and the sled has to be determined if 35 N is required to move the sled with...

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• Physics
The drag force on the rocket is 15 N. The thrust force created by the engines of the rocket is 89 N. The mass of the rocket is 6 kg. For the rocket to take off, the upward force acting on the...

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• Physics
The vertical spring has a load 200 g suspended from it. It stretches 10 cm under the load. If the spring constant is k, the potential energy stored in the spring when it is extended by x is given...

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• Physics
When the basketball is thrown up an initial velocity is imparted to it. This gives the ball a kinetic energy equal to (1/2)*m*v^2 where m is the mass of the ball and v is the velocity with which it...

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• Physics
The hockey puck has a mass 0.16 kg. It starts from rest and reaches a speed of 22 m/s, during which the distance traveled is 1.2 m. Initially the puck has no kinetic energy. After 1.2 m the kinetic...

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• Physics
The wall is made of forty 2.0 kg blocks each 20 cm thick. They are arranged in 4 rows one on top of the other each with 10 blocks. One row can be considered to be a single object of mass 10*2 = 20...

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• Science
When the ball is thrown downwards it accelerates downwards due to the gravitational force of attraction of the Earth at 9.8 m/s^2. If an object has an initial velocity of u m/s and it is...

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• Physics
The rope pulls the 2.0 kg buckets vertically upwards accelerating it from rest at 2.2 m/s^2 for 3 seconds. In 3 seconds, the distance traveled by the bucket is equal to s = u*t + (1/2)*a*t^2. Here...

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• Physics
If a car moves down a hill at a constant velocity, the momentum will remain the same. Here's why: momentum is the product of the velocity and the mass of an object. In this case, since the mass...

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• Physics
I hope you know that when the rays from an object fall on any mirror (concave convex or plane), an image is formed. In case of a place mirror, the object is placed in front of the mirror and image...

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• Physics
You should remember that you may find velocity using the following equation such that: v = displacement/ time Since the problem provides the value of displacement and the time you need to...

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• Physics
One major problem with intrasolar and interstellar communication is the vast distances involved. On Earth, radio communication is all-but instantaneous, because radio waves travel at the speed of...

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• Physics
The moment of inertia of the forearm (modeled by a rod rotating about one end) and the ball in hand (modelled by a single mass at distance R) rotating about the elbow is `I = I_("forearm")...

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• Physics
Yes, a car's kinetic energy changes with the speed. Think about it. If a car is going faster, it has more potential to do damage. Cars going slower have less potential energy than cars going faster.

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• Physics
The Moment of Force or Torque is the measurement of force applied to a body in such a way that the body is subjected to rotational change in its position. This is one definition of "moment" in...

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• Physics
You should select the coefficient of friction mu between two pieces of wood of 0.2 (wet wood) or 0.5 (clean wood). Considering `mu = 0.5` and using the equation that relates the friction force, mu...

Asked by blasto63 on via web

• Physics
You should use the equation that relates the frictionn force and normal force such that: `F_f = mu_s*N` You need to remember that you may substitute `N = G = m*g` such that: `F_f = mu_s*(m*g)` You...

Asked by bobby9901 on via web

• Physics
Starting from rest, the total distance that is traveled to reach a velocity of 6 m/s is 5 m. Use the formula v^2 - u^2 = 2*a*s, where v is the final velocity, u is the initial velocity, a is the...

Asked by lkehoe on via web

• Physics
a) You should remember the equation that relates the distance, velocity and time such that: `D = v*t` The problem provides the velocity and the total distance, hence, you should evaluate the time...

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• Physics
John has travelled past the 234 km marker. He stops at the 134 km marker and returns along his path to the 180 km marker. What is his resultant displacement from the 234 km marker? The total...

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• Physics
There are two forces acting on the elevator. One of them is the weight of the elevator. The weight of the elevator is equal to the force with which it is being attracted to the Earth due to the...

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• Physics
The displacement of water is an excellent way to measure the volume of a solid provided that the solid does not dissolve in water and that it does not float. If the object floats then it will not...

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• Physics
The way that oil filled radiator heaters work is by electricity. This is used to heat up heating elements within the heater that causes the oil that fills the radiator to rise in temperature. This...

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• Physics
The airplane is traveling at 190 kph in the horizontal direction and supplies have to be dropped for flood victims on an island 160 m below. The acceleration due to gravity is 9.8 m/s^2 in the...

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• Physics
We need to resolve motion into two perpendicular directions In the vertical direction Distance=39.2 m Initial velocity= 0 Accelaration= 10 m/s^2 Using S=ut+(at^2)/2 39.2=0+(10*t^2)/2 =>t^2=7.84...

Asked by deannahasan5 on via web

• Physics
You should remember the equation that gives Young's modulus of elasticity such that: `Y = (stress)/(strain) => Y = (F/A)/(x/L) => Y = (FL)/(Ax)` Substituting the converted given values in the...

Asked by narmou on via web

• Physics
An object with an initial velocity u m/s, accelerating at a m/s^2 for a time period t has a velocity v = u + a*t after t seconds. The distance traveled by the object in t seconds is given by s =...

Asked by emmalittrell on via web

• Physics
The mass of the ship is 6.5*10^7 kg and it is moving at a speed of 12 m/s. The kinetic energy of the ship is given by K.E. = (1/2)*m*v^2 = (1/2)*6.5*10^7*12^2 => 4.68*10^9 J To stop the ship the...

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• Physics
work done = force * displacement = 20 kg * 4m = 80 J

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• Physics
When a body with mass m is held at a height h above the ground, it has a gravitational potential energy with respect to the ground equal to PE = m*g*h. If the body is left, it falls towards the...

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• Physics
The ball rolls off the top of a stairway horizontally with a velocity of 4.5m/s. Each step is 0.2m high and 0.3m wide. Let the ball land on the nth step. The horizontal distance covered by the ball...

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• Physics
Zach has a mass of 73 kg and is in an elevator. Initially the elevator is descending at a constant speed of 12 m/s. Zach's apparent weight during this period is equal to the acceleration due to...

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• Physics
The first airplane leaves at 1 pm at a speed of 800 kmph traveling North 35 degrees East. At 2 pm another airplane leaves at 1000 kmph traveling directly East. At 4 pm the distance traveled by the...

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• Physics
A 100 N box falls from a truck moving at 25 m/s. The kinetic energy of the box when it falls is (1/2)*(100/9.8)*25^2 = 3.188 kJ. A frictional force acts on the box when it lands on the highway that...

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• Physics
A 4 kg bag of potatoes is held by a string. The tension in the string is equal to the force exerted on it by the bag of potatoes. Force is given by the product of mass and acceleration. As the...

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• Physics
The initial momentum of the small object is 5 kg*m/s towards the larger object that is at rest. After collision, the small object bounces back with a momentum that has a magnitude or 4 kg*m/s. As...

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• Physics
A bulb glows when an electric charge flows through the filament in the bulb. The flow of current I creates heat in the filament that is equal to I^2*R*t where R is the resistance of the filament...

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• Physics
When a mass M is placed in a centrifuge that is rotating at w rad/s and if r is the radius of the centrifuge, the centrifugal force on the mass is equal to F = M*w^2*r. The maximum mass that can be...

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• Physics
The centrifuge rotates at 24000 rpm. The radius of the centrifuge is 0.06 cm. A mass is held with a tensile strength of 120000 N. The maximum mass that can be held has to be determined. The speed...

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• Physics
Using Hooke's Law F = -kx, the spring constant of the spring can be determined. When a person with a mass of 90 kg gets into the car, the springs sag by 12 cm. The force exerted by the mass of 90...

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• Physics
Time, to me, is two things. First, time is a context wherein events occur. Time is without depth or breadth in this view and is strictly, only, defined as the current moment of existence. Second,...

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• Physics
The energy dissipated in moving a charge Q between a potential difference V is equal to E = Q*V Here the cloud is at a potential 8*10^6 V relative to the ground. A charge of 40 C is transferred in...

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• Physics
In the question, the father pulls a rope with a force F. The rope makes an angle of 30 degrees with the horizontal and is attached to a series of sleds on which his twins with a mass m are seated....

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• Physics
Bi convex lens is commonly used in magnifying glass to observe small things,to read very small letters,to find cracks on printed circuit board etc.It is also used in compound microscope and...

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• Physics
When electrical power passes through a conductor a part of it is lost as heat in the conductor due to the resistance of the conductor. The power transmitted through a resistor is dependent on the...

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• Physics
A transformer is an electrical device that has two inductively linked conductors. When a voltage is applied across one of the conductors there is a voltage induced in the other conductor. Step up...

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