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Physics Questions
Find the current in each branch of the circuit. Specify the direction of each.
A long straight wire carries a current of 50.0 A. An electron, travelling at 1.0 x 107 m/s is 5.0 cm from the wire. What force (magnitude and direction) acts on the electron if the electron’s velocity is directed towards the wire?
Vector A has a magnitude of 17 units, vector B has a magnitude of 9.2 units, and A * B has a value of 14.0. What is the angle between the directions of Vector A and B ?
An object, previously at rest, slides #15 m# down a ramp, with an incline of #pi/3 #, and then slides horizontally on the floor for another #10 m#. If the ramp and floor are made of the same material, what is the material's kinetic friction coefficient?
A box with an initial speed of #3 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #5/6 # and an incline of #( pi )/3 #. How far along the ramp will the box go?
What is the final velocity of a body that accelerates at #"150 m/s"^2"# for #"2 s"# from a velocity of #"75 m/s"#?
A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?
A man of mass 80 kg is standing in a lift, which is accelerating upwards with an acceleration of 0.6 ms-2. The size of the force between the man and the lift floor is ___N?
The current of a river is 2 miles per hour. A boat travels to a point 8 miles upstream and back again in 3 hours. What is the speed of the boat in still water?
The rate of rotation of a solid disk with a radius of #8 m# and mass of #5 kg# constantly changes from #16 Hz# to #5 Hz#. If the change in rotational frequency occurs over #7 s#, what torque was applied to the disk?
A ball with a mass of # 5 kg# is rolling at #9 m/s# and elastically collides with a resting ball with a mass of #2 kg#. What are the post-collision velocities of the balls?
A car, which is accelerating uniformly from rest, travels a distance of 28.5 m in the tenth second of its motion. What is its acceleration?
An object is at rest at #(8 ,5 ,4 )# and constantly accelerates at a rate of #1/4 m/s^2# as it moves to point B. If point B is at #(2 ,4 ,5 )#, how long will it take for the object to reach point B? Assume that all coordinates are in meters.
Two objects have masses of #36 MG# and #18 MG#. How much does the gravitational potential energy between the objects change if the distance between them changes from #81 m# to #3 m#?
Why does a buoyant force act on every object in a fluid?
How to solve with explanations ?please thanks !
A spring extends in length by #4.0# #cm# when a mass of #1.5# #kg# is hung from it. What is the spring constant of the spring?
What produces the light to make images on a television or computer screen?
What is the force, in terms of Coulomb's constant, between two electrical charges of #16 C# and #3 C# that are #2 m # apart?
There is a boy with a mass of 55kg starting at rest going down a slide which is 4m high (y distance) and 6m (x distance) and his final velocity at the end is 4.5m/s then what is the average F of friction acting against him as he goes down the slide?
A hiker travels 3.5 km at an angle of 35° northeast, then changes direction and travels 5.5 km at an angle of 22° northwest. What is the magnitude and direction of the hiker's total displacement?
With what speed in Km/h must an object be thrown to reach a height of 91.5 m? Assume negligible air resistance.
How is the efficiency of a heat engine determined?
A projectile is shot from the ground at a velocity of #25 m/s# and at an angle of #(2pi)/3#. How long will it take for the projectile to land?
What is a agonimeter?
A balanced lever has two weights on it, the first with mass #7 kg # and the second with mass #55 kg#. If the first weight is # 9 m# from the fulcrum, how far is the second weight from the fulcrum?
A model rocket is fired vertically upward from rest. Its acceleration for the first 3 seconds is a(t) = 60t at which time the fuel is exhausted and it becomes a freely "falling" body. 14 seconds later, the rocket's parachute opens, and the (down)?
A container has a volume of #21 L# and holds #24 mol# of gas. If the container is compressed such that its new volume is #12 L#, how many moles of gas must be released from the container to maintain a constant temperature and pressure?
The position equation for a particle is s of t equals the square root of the quantity 2 times t plus 1 where s is measured in feet and t is measured in seconds. Find the acceleration of the particle at 4 seconds?
An object is at rest at #(2 ,1 ,6 )# and constantly accelerates at a rate of #1/4 m/s^2# as it moves to point B. If point B is at #(3 ,4 ,7 )#, how long will it take for the object to reach point B? Assume that all coordinates are in meters.
What is mass of light?
What is the path of the light ray that hits a mirror after passing through its focus?
If an object travels East at a speed of 3 m/sec for 5 seconds, then North at a speed of 2 m/sec for 10 seconds, what distance did it travel? what is its displacement?
Some very hot rocks have a temperature of #420 ^o C# and a specific heat of #180 J/(Kg*K)#. The rocks are bathed in #9 L# of boiling water. If the heat of the rocks completely vaporizes the water, what is the minimum combined mass of the rocks?
A solid disk with a radius of #6 m# and mass of #8 kg# is rotating on a frictionless surface. If #3 W# of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at #8 Hz#?
An operating 100-watt lamp is connected to a 120- volt outlet. What is the total electrical energy used by the amp in 60 seconds?
An object with a mass of #3 kg#, temperature of #360 ^oC#, and a specific heat of #24 J/(kg*K)# is dropped into a container with #32 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?
A container has a volume of #24 L# and holds #32 mol# of gas. If the container is compressed such that its new volume is #7 L#, how many moles of gas must be released from the container to maintain a constant temperature and pressure?
What period corresponds to 500 Hz?
An object's velocity is given by #v(t) = (2t^2 -t +2 , sint )#. What is the object's rate and direction of acceleration at #t=3 #?
A weightlifter expends 294 W of power lifting a weight to a height of 2 m in 10 seconds. What mass has he lifted?
How far will 350 J raise a 70 Newton block?
A #5 L# container holds #7 # mol and #4 # mol of gasses A and B, respectively. Groups of four of molecules of gas B bind to three molecule of gas A and the reaction changes the temperature from #250^oK# to #370 ^oK#. By how much does the pressure change?
It is question about finding distance from velocity time graph?
A 74 kg student starting from rest, slides down an 11.8 meter high water-slide. How fast is he going at the bottom of the slide?
How to convert between measurement units?
A charge of #4 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #21 J# to #17 J#, what is the voltage between points A and B?
An object with a mass of # 3 kg# is traveling in a circular path of a radius of #7 m#. If the object's angular velocity changes from # 6 Hz# to # 9 Hz# in #3 s#, what torque was applied to the object?
A laser is thrown upward with a speed of #12# #ms^-1# on the surface of Planet X where the acceleration due to gravity is #1.5# #ms^-2# and there is no atmosphere. How long does it take for the laser to reach the maximum height?
A solid disk with a radius of #9 m# and mass of #4 kg# is rotating on a frictionless surface. If #360 W# of power is used to increase the disk's rate of rotation, what torque is applied when the disk is rotating at #15 Hz#?
If an object is moving at #50 m/s# over a surface with a kinetic friction coefficient of #u_k=2 /g#, how far will the object continue to move?
What is the speed of an object that travels from #( -1, 7,2) # to #( -3, -1,0 ) # over #2 s#?
In a blood transfusion,blood flow from a battle at atmospheric pressure into a patient vein in which the pressure is 20mmHg higher than atmospheric.The bottle is 95cm higher than the vein and the needle into the vein has length of 3cm and diameter 0.45mm?
An object is at rest at #(5 ,2 ,1 )# and constantly accelerates at a rate of #2/3 m/s# as it moves to point B. If point B is at #(4 ,9 ,8 )#, how long will it take for the object to reach point B? Assume that all coordinates are in meters.
A particle with a charge of 4.43 x 10^-6C is placed between two parallel plates and feels a force of -4.71 x 10^-4N. What is the strength of the field between the two plates?
What electromagnetic waves travel the fastest?
A concave mirror with a focal length of 16.0 cm produces an images located 38.6cm from the mirror. what is the distance of the object from the front of the mirror?
How to calculate the force of gravitational attraction between a person (mass=75 kg) & Earth (mass 5.98x10^24 kg and mean radius 6.37x10^6m) ?
A model train, with a mass of #15 kg#, is moving on a circular track with a radius of #3 m#. If the train's rate of revolution changes from #2 Hz# to #1 Hz#, by how much will the centripetal force applied by the tracks change by?
What is the force, in terms of Coulomb's constant, between two electrical charges of #1 C# and #-2 C# that are #2 m # apart?
A jet plane accelerate from rest on runway at 4m/s^-2. find the distance covered after 5s?
An object with a mass of #6 kg# is on a plane with an incline of # -(3 pi)/8 #. If it takes # 15 N# to start pushing the object down the plane and #5 N# to keep pushing it, what are the coefficients of static and kinetic friction?
Find the current in each branch of the circuit.
A tow truck pulls a car 5.00 \rm km along a horizontal roadway using a cable...
A 1.50 kg book is sliding along a rough horizontal surface. At point A it is...
If the rocket is launched at 45.0 above horizontal and reaches a maximum height of 4.0 m, how far away does it land from its starting position?
Please Help! Annie is traveling on a trail at 22 m/s. After traveling for 16 seconds at a constant velocity she approaches a stoplight which has turned red. Being a good doggo she slows to a stop with an acceleration of -2.1 m/s^2 as she nears the stopli
A uniform 2.5 T magnetic field points to the right. A 3.0-m-long wire, carrying 15 A,...
Elevator Problem
How many grams of water would require 2,153 joules of heat to raise its temperature from 44 °C to 81 °C? The specific heat of water is 4.184 J/g °C.
An object with a mass of # 12 kg# is lying still on a surface and is compressing a horizontal spring by #1 m#. If the spring's constant is # 2 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
A spring with a constant of #5 (kg)/(s^2)# is lying on the ground with one end attached to a wall. An object with a mass of #5 kg # and speed of # 7 m/s# collides with and compresses the spring until it stops moving. How much will the spring compress?
What is the frequency of this sound?
The moment of inertia for a solid cylinder about the axis of symmetry is what?
Which light diverge in prism?
How fast will an object with a mass of #15 kg# accelerate if a force of # 75 N# is constantly applied to it?
Two 0.68 Fµ capacitors are connected in series across a 10 kHz sine wave signal source. What is the total capacitive reactance?
Ahmad and George took a circular route of 7 km that starts and ends at the same point?
What is the kinetic energy of an object with a mass of #1 kg# that has been in freefall for #2 s#?
A model train, with a mass of #6 kg#, is moving on a circular track with a radius of #7 m#. If the train's rate of revolution changes from #4 Hz# to #2 Hz#, by how much will the centripetal force applied by the tracks change by?
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