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Physics Questions
The intensity of sunlight hitting the earth is about 1300 W/m2. If sunlight strikes a perfect...
An object accelerates from rest to #5.9# #ms^-1# in #8.5# #s#. How far does it travel in this time?
An object's two dimensional velocity is given by #v(t) = ( 1/t, t^2)#. What is the object's rate and direction of acceleration at #t=6 #?
An object with a mass of #90 g# is dropped into #750 mL# of water at #0^@C#. If the object cools by #30 ^@C# and the water warms by #4 ^@C#, what is the specific heat of the material that the object is made of?
A stone of mass 1.0kg is dropped from a certain height and takes 8 seconds for the stone to strike the sandy ground, upon reaching the ground the stone penetrate 5.0 into the ground ( take g=10m/s) A)calculate de height from where the stone is dropped?
A truck pulls boxes up an incline plane. The truck can exert a maximum force of #5,200 N#. If the plane's incline is #(5 pi )/8 # and the coefficient of friction is #4/3 #, what is the maximum mass that can be pulled up at one time?
There are three parallel tracks of 120 km,between x and y.Train A starts at 9:00 am on the central track at speed of 60 km/hr from X.Train B starts at 10:00 am at speed of 60 km/hr from y.Train C starts at 11:00 am at 9 km/hr from x.------(continued)?
If a #1/24 kg# object moving at #1/3 m/s# slows to a halt after moving #10/27 m#, what is the coefficient of kinetic friction of the surface that the object was moving over?
Is it true that capacitors "store" charges? If so, how come the total amount of charge being supplied to a (capacitor containing) circuit, remains the same?
A vehicle requires a force of #300# #N# to move #30# #m# at constant velocity in #3# #s#. What power does the vehicle's engine exert?
What is the kinetic energy of an object with a mass of 10 kilograms traveling at a speed of 10 m/s? Assume no other forces act upon the object.
A plane is flying horizontally at 98 M per second and releases an object which reaches the ground in 10 seconds the angle made by 8 while hitting the ground is?
A hiker shouts toward a vertical cliff 685 m away. The echo is heard 4.00 s later. What is the speed of sound in air?
A charge of #4 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #35 J# to #9 J#, what is the voltage between points A and B?
An object with a mass of #2 kg# is acted on by two forces. The first is #F_1= < 2 N , 3 N># and the second is #F_2 = < -7 N, 1 N>#. What is the object's rate and direction of acceleration?
3 particles start from origin with velocity #u_1,u_2 and u_3#.They are moving with constant velocities.Find the relation between #u_1,u_2 and u_3# so that all 3 particles lie on the same plane?
Two objects have masses of #4 MG# and #8 MG#. How much does the gravitational potential energy between the objects change if the distance between them changes from #150 m# to #450 m#?
Give a brief description about ENTROPY in physics?
A solid disk, spinning counter-clockwise, has a mass of #14 kg# and a radius of #5/4 m#. If a point on the edge of the disk is moving at #7/9 m/s# in the direction perpendicular to the disk's radius, what is the disk's angular momentum and velocity?
How to find magnitude of the force?
What is the speed of an object that travels from #( -2, -5, 1 ) # to #( -5 , -7, 4 ) # over #2 s#?
Here is a question about Hooke's law I need help with. I don't think I did it right - as usual! Thanks!?!
How do you convert 30ml^3 to m^3 ?
Which has more momentum, a #4kg# object moving at #4m/s# or a #5kg# object moving at #9m/s#?
What is the dot product of ## and ##?
A portable electric heater has a resistance of 15 ohms. It plugs into a wall outlet that is 120 V. How much current does it draw?
What is the acceleration due to gravity here on Earth?
Particle moving under influence of a constant force is given by V =√|4-2X| where X is magnitude of displacement of the particle At t=0 initially the particle is noticed to be moving towards east.The distance travelled by the particle in first 5seconds is?
A solid disk with a radius of #2 m# and mass of #3 kg# is rotating on a frictionless surface. If #36 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 object with a mass of # 3 kg# is traveling in a circular path of a radius of #2 m#. If the object's angular velocity changes from # 3 Hz# to # 6 Hz# in # 5 s#, what torque was applied to the object?
What is the kinetic energy of a #16 kg# object moving at #4 m/s#?
A car accelerates uniformly at a rate of 2.8 m/s^2. How long does it take for the car to accelerate from a speed of 12.7 m/s to a speed of 19.3 m/s?
Flying against the wind, a jet travels 3040 miles in 4 hours. Flying with the wind, the same jet travels 8260 miles in 7 hours. What is the rate of the jet in still air, and what is the rate of the wind?
If an object with uniform acceleration (or deceleration) has a speed of #12 m/s# at #t=0# and moves a total of 48 m by #t=6#, what was the object's rate of acceleration?
What substance is reduced in a lead storage battery?
Please help?
If two people pull on either side of a rope with a force of 250 N why do we say that the force of tension in the rope 250 N?
Mousetrap Car-Find Average Force of Snap-Please Help?
What torque would have to be applied to a rod with a length of #4 m# and a mass of #2 kg# to change its horizontal spin by a frequency #9 Hz# over #2 s#?
What is The amount of force needed to sustain motion of a rock in outer space?
Does a man do work when he carries a 75 N bag horizontally for 5 m? Why / why not?
An object travels North at # 7 m/s# for #6 s# and then travels South at # 3 m/s# for # 8 s#. What are the object's average speed and velocity?
An object travels North at #7 m/s# for #5 s# and then travels South at #9 m/s# for # 2 s#. What are the object's average speed and velocity?
A model train with a mass of #4 kg# is moving along a track at #6 (cm)/s#. If the curvature of the track changes from a radius of #32 cm# to #15 cm#, by how much must the centripetal force applied by the tracks change?
Harry is standing 2 m in front of a flat mirror. How far behind the mirror is his image and what is the magnification of the image?
A toroidal solenoid (see the figure ) has inner radius 14.1cm and outer radius 18.6 cm...
How much power is needed to accelerate an object with a mass of #4 kg# and a velocity of #7 m/s# at a rate of #5 m/s^2#?
-True or false? 2.the resultant acceleration of aparticle in accelerated circular motion is always along the radius of the. circle and towards the center.
An object is thrown with a speed u at an angle of 60 degree to the horizontal. the time elapsed between the instants when its velocity vector makes 30degree with the horizontal is?
The rate of rotation of a solid disk with a radius of #8 m# and mass of #2 kg# constantly changes from #5 Hz# to #2 Hz#. If the change in rotational frequency occurs over #12 s#, what torque was applied to the disk?
An object is thrown horizontally from a height how does the time of flight and the range of the object change when the magnitude of initial velocity tripled?
A ball with a mass of # 3 kg# is rolling at #15 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?
A #0.15"m"# wire carrying a current of #4.5"A"# is subject to a magnetic field, which produces a #1.0"N"# force on the wire. What is the magnitude of the magnetic field strength?
A model train, with a mass of #4# #kg#, is moving on a circular track with a radius of #3# #m#. If the train's kinetic energy changes from #12# #J# to #48# #J#, by how much will the centripetal force applied by the tracks change by?
The half-life for the radioactive decay of C-14 is 5730 years.How long will it take for 30% of the C-14 atoms in a sample of C-14 to decay?
A charge of #15 C# passes through a circuit every #2 s#. If the circuit can generate #15 W# of power, what is the circuit's resistance?
A ball is thrown upward at an angle of 30° to the horizontal and lands on the top edge of a building is 20 m away. The top edge is 5 m above the throwing point. How fast was the ball thrown?
An object with a mass of #15 kg# is hanging from an axle with a radius of #24 m#. If the wheel attached to the axle has a radius of #9 m#, how much force must be applied to the wheel to keep the object from falling?
A circuit with a resistance of #7 Omega# has a fuse melts at #6 A#. Can a voltage of #11 V# be applied to the circuit without blowing the fuse?
A ball with a mass of #8 kg# moving at #3 m/s# hits a still ball with a mass of #15 kg#. If the first ball stops moving, how fast is the second ball moving?
A ball with a mass of #5 kg # and velocity of #6 m/s# collides with a second ball with a mass of #3 kg# and velocity of #- 7 m/s#. If #40%# of the kinetic energy is lost, what are the final velocities of the balls?
The object is moved to 4cm from the same lens. How would you calculate the distance to the image from the lens, the magnification, and the height of the image?
An object with a mass of #4 kg# is hanging from an axle with a radius of #6 cm#. If the wheel attached to the axle has a radius of #12 cm#, how much work would it take to turn the wheel #8 cm#?
A simple circuit consists of a device placed between the terminals of an ideal battery. If a current of 3.0 Amps is maintained in the circuit, and the delivers electrical energy at a rate of 25 Watts, how large is the resistance of the device?
Some very hot rocks have a temperature of #160 ^o C# and a specific heat of #90 J/(Kg*K)#. The rocks are bathed in #30 L# of boiling water. If the heat of the rocks completely vaporizes the water, what is the minimum combined mass of the rocks?
What is the angular momentum of a rod with a mass of #15 kg# and length of #4 m# that is spinning around its center at #15 Hz#?
What are metric units?
A model train with a mass of #9 kg# is moving along a track at #18 (cm)/s#. If the curvature of the track changes from a radius of #32 cm# to #42 cm#, by how much must the centripetal force applied by the tracks change?
An object with a mass of #8 kg# is on a plane with an incline of #pi/8 #. If the object is being pushed up the plane with # 12 N # of force, what is the net force on the object?
A turntable rotates at 45 r.p.m. What is it's angular speed?
Limiting equilibrium means #ma=0# In #F-f=ma# ?
Maria and Ming drive in different directions starting at the same point. Maria drives 30 mph and Ming drives 32 mph. How far apart will they be in 2 hours?
What is inertia?
An electric toy car with a mass of #4 kg# is powered by a motor with a voltage of #3 V# and a current supply of #8 A#. How long will it take for the toy car to accelerate from rest to #3 m/s#?
An object has a mass of #6 kg#. The object's kinetic energy uniformly changes from #18 KJ# to # 4KJ# over #t in [0,12s]#. What is the average speed of the object?
An object with a mass of #3 kg#, temperature of #210 ^oC#, and a specific heat of #24 J/(kg*K)# is dropped into a container with #36 L # of water at #0^oC #. Does the water evaporate? If not, by how much does the water's temperature change?
How can i calculate the speed of sound on a day when a 1500 hz frequency has a wavelength of 0.221 m.?
The position of an object moving along a line is given by #p(t) = 2t - cos(( pi )/6t) #. What is the speed of the object at #t = 3 #?
What is the wavelength of object inside inside a material if the material has an index of refraction #n = 38.6# and frequency #0.32# THz?
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, what is the time taken by the boat to go 68 km downstream?
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