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Physics

PhysicsAn 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...

PhysicsA uniform crate with a mass of 29 kg rests on a floor with a coefficient of static friction equal...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...

PhysicsThe 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...

PhysicsThe 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...

PhysicsThe 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...

PhysicsThe 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...

PhysicsWhen 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...

PhysicsThe 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...

PhysicsThe 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...

ScienceWhen 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...

PhysicsThe 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...

PhysicsIf 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...

PhysicsI 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...

PhysicsYou 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...

PhysicsOne major problem with intrasolar and interstellar communication is the vast distances involved. On Earth, radio communication is allbut instantaneous, because radio waves travel at the speed of...

PhysicsThe 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")...

PhysicsYes, 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.

PhysicsThe 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...

PhysicsYou 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...

PhysicsYou 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...

PhysicsStarting 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...

Physicsa) 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...

PhysicsJohn 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...

PhysicsAn elevator suspended by a vertical cable is moving downward but slowing down. Should the tension...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...

PhysicsThe 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...

PhysicsThe 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...

PhysicsThe 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...

PhysicsWe 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...

PhysicsYou 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...

PhysicsAn 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 =...

PhysicsThe 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...

Physicswork done = force * displacement = 20 kg * 4m = 80 J

PhysicsWhen 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...

PhysicsThe 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...

PhysicsZach 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...

PhysicsAt 1 pm, an airplane left an airport at a speed of 800 kph and is heading N 35 degrees E. An hour...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...

PhysicsA 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...

PhysicsA 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...

PhysicsThe 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...

PhysicsA 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...

PhysicsWhen 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...

PhysicsThe 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...

PhysicsUsing 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...

PhysicsTime, 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,...

PhysicsA cloud is at a potential 8.0x10^6 V relative to the ground. A charge of 40 C is transferred in a...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...

PhysicsIn 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....

PhysicsBi 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...

PhysicsWhen 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...

PhysicsA 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...

PhysicsWhen a body is placed in a fluid, there is an upward force exerted on the body that is equal to the weight of the fluid displaced by it as it sinks into the fluid. When this force is equal to the...