Master Physics with Fun Quizzes & Brain Teasers!

An electron is initially moving at 1.4 x 107 m/s. It moves 3.5 m in the direction of a uniform electric field of magnitude 120 N/C. What is the kinetic energy of the electron at the end of the motion
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A 0.40-kg particle moves under the influence of a single conservative force. At point A, where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is 40 J. As the particle moves from A to B, the force does 25 J of work on the particle. What is the value of the potential energy at point B
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Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of ones birth. The only known force that a planet could exerts on us is gravitational, so if there is anything to astrology we should expect this force to be significant.Required:a. Calculate the gravitational force, in Newtons, exerted on a4.1kgbaby by a120kgfather who is a distance of0.18maway at the time of its birth.b. Calculate the force on the baby, in Newtons, due to Jupiter (the largest planet, which has a mass of1.9010^27kg if it is at its closest distance to Earth,6.2910^11maway.c. What is the ratio of the force of the father on the baby to the force of Jupiter on the baby?
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A spherical conductor with a 0.193 m radius is initially uncharged. How many electrons should be removed from the sphere in order for it to have an electrical potential of 7.10 kV at the surface?
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An object suspended from a spring vibrates with simple harmonic motion. Part A At an instant when the displacement of the object is equal to one-fourth the amplitude, what fraction of the total energy of the system is kinetic
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Which formula can be used to find velocity if kinetic energy and mass are known? v = The square root of one half times K E and mass. v = Square Root of StartFraction 2 times m over K E EndFraction. v = Square Root of K E times m v = Square Root of StartFraction 2 times K E over m EndFraction.
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Giving quadrilateral a(2,-1 ) b ( 1,3) c(6,5) d(7,1) you want to prove that it is a parallelogram by showing opposite sides are congruent . what formula would you use ? show that sb is congruent to cd
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Question 19 of 252 PointsA portable electric heater has a resistance of 8 ohms. It plugs into a walloutlet that is 120 V. How much current, in amps, does it draw?Answer hereSUBM
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A low C (f = 65Hz) is sounded on a piano. If the length of the piano wire is 2.0 m and its mass density is 5.0 g/m2, determine the tension of the wire.
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in which condition the acceleration due to garvity is zero
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what is the orbital speed for a satellite 3.5 x 10^8m from the center of mars? Mars mass is 6.4 x 10^23 kg
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The engine of the car develops a driving force of 4000N. Air resistance also acts on the car, with a force of R. If the car has a mass of 1000kg, and is accelerating at 1.5m/s^2, calculate the magnitude of R.
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What are the units of impulse
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A car travels 2500 m in 8 minutes. Calculate the speed at which the car travelled
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what are concave mirrors used in
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Calculate the potential energy of a mass of 5kg raised 4m above theground. (g = 10m/s)Your answer
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A gun is fired with muzzle velocity 1114 feet per second at a target 4950 feet away. Find the minimum angle of elevation necessary to hit the target. Assume the initial height of the bullet is 0 feet, neglect air resistance, and give your answer in degrees.
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A small spinning asteroid is in a circular orbit around a star, much like the earth's motion around our sun. The asteroid has a surface area of 9.50 m2. The total power it absorbs from the star is 4400 W. Assuming the surface is an ideal absorber and radiator, calculate the equilibrium temperature of the asteroid (in K).
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3. A 4.1 x 10-15 C charge is able to pick up a bit of paper when it is initially 1.0 cm above the paper. Assume an induced charge on the paper of the same magnitude, find the weight of the paper in newtons. Remember to convert the distance to meters and show your work here.
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Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1200 kg and was approaching at 6.00 m/s due south. The second car has a mass of 900 kg and was approaching at 25.0 m/s due west. (a) Calculate the final velocity (magnitude in m/s and direction in degrees counterclockwise from the west) of the cars. (Note that since both cars have an initial velocity, you cannot use the equations for conservation of momentum along the x-axis and y-axis; instead, you must look for other simplifying aspects.) magnitude m/s direction counterclockwise from west (b) How much kinetic energy (in J) is lost in the collision? (This energy goes into deformation of the cars.) J
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Charge is uniformly distributed throughout a spherical insulating volume of radius R=4.00 cm . The charge per unit volume is 6.5 Cm3 Find the electric field at the center of the sphere. Enter a positive number if the field points radially out, negative if the field points radially in, or zero if there is no field.
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when I jump and land on the surface I exerts a force on the surface and the surface should exert the same amount of force on me, therefore I should be jumping again according to the 3rd law of motion but I don't why is that
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what would happen if aluminum was used in place of iron at the center of a sparkler wire?
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The four tires of an automobile are inflated to a gauge pressure of 2.2 105 Pa. Each tire has an area of 0.022 m2 in contact with the ground. Determine the weight of the automobile.
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