Master Physics with Fun Quizzes & Brain Teasers!

The outer circle illustrates the moon as it looks from Earth. Which of the following BEST explains why we see different phases of the moon each night from our position on Earth? The amount of sunlight reflected from the moon's surface changes each night.
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The diagram below shows two identical metal spheres, A and B, separated by a distance d. Each sphere has mass m and possesses charge q. Sphere A has a positive charge & sphere B has a negative charge.Which diagram best represents the directions of the gravitational force, Fg , and the electrostatic force, Fe , acting on sphere A due to the mass and charge of sphere B? [Vectors are not drawn to scale.]
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why can't cars be constructed that can magnetically levitate in earth's magnetic field? (select all that apply.)
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derive dynamic equations of the electrical system shown below (use current i1 and i2 as states). then derive dynamic equations of an analogous mechanical system and draw a schematic diagram.
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(refer to figure 14.) if the terrain elevation is 1,295 feet msl, what is the height above ground level of the base of the ceiling?
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A clock pendulum oscillates at a frequency of 2.5 Hz . At t=0, it is released from rest starting at an angle of 13 to the vertical.Part A Ignoring friction, what will be the position (angle in radians) of the pendulum at t = 0.25 s ? Express your answer using two significant figures.Part B Ignoring friction, what will be the position (angle in radians) of the pendulum at t = 2.00 s ? Express your answer using two significant figures.Part C Ignoring friction, what will be the position (angle in radians) of the pendulum at t = 540 s ? Express your answer using two significant figures.
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a disk is spinning with angular velocity on a pivoted horizontal axle as shown. gravity acts down. 1)in which direction does precession cause the disk to move?
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find the equivalent resistance of the circuit in figure p18.6. (r1 = 16 , r2 = 18 )
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As part of your job at the patent office, you are asked to evaluate the six designs shown in the figure for innovative new heat engines. (Figure 1)Part AWhich of the designs violate(s) the first law of thermodynamics?
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The speed of surface waves in water decreases as the water becomes shallower. Suppose waves travel across the surface of a lake with a speed of 2.1 and a wavelength of 1.9 . When these waves move into a shallower part of the lake, their speed decreases to 1.7 , though their frequency remains the same.Find the wavelength of the waves in the shallower water.
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soap bubbles can display impressive colors, which are the result of the enhanced reflection of light of particular wavelengths from the bubbles' walls. for a soap solution with an index of refraction of 1.27, find the minimum wall thickness that will enhance the reflection of light of wavelength 701 nm in air.
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a 2 kg solid ball (solid like a bowling ball) is rolling down a horizontal street at 7.5 m/s. what is its total kinetic energy? note: you can find moments of inertia in the reading.
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Hendry throws an object vertically upwards at a velocity of 26,5 ms-1 from the edge of a cliff of height 120m. After some time, the projectile lands on the ground below the cliff After 1 second, Cathy fires a second object upwards FROM THE GROUND BELOW with a velocity of 45 ms-1. Calculate the time and distance will the two objects meet.
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what is a modifier?(1 point)responsesa word or phrase that provides descriptiona word or phrase that provides descriptiona word that replaces a nouna word that replaces a nouna complete sentencea complete sentencea sentence that is missing an adjective
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The amount of linear expansion of a long rod does not depend on The original length of the rod The specific heat of the rod The change in the absolute temperature of the rod The coefficient of linear expansion The material out of which the rod is made
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the magnitude of the gravitational force exerted on the block is fg , and the magnitude of the normal force exerted by the track on the block is fn . which of the following correctly compares the magnitudes of these two forces when the block is at the lowest point on the track? responses fn>fg f sub n is greater than f sub g fn
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a 4149-kg truck traveling with a velocity of 12 m/s due east collides head-on with a 899-kg car traveling with a velocity of 40 m/s due west. the two vehicles stick together after the collision.note: this is a multi-part question. once an answer is submitted, you will be unable to return to this part.
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find new breakpoints for the data that span only the 0.05 and 0.95 quantiles in r
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which fbd would most likely represent a car driving on a level surface with a constant velocity
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6) what is the minimum allowable radius of the round whose basic size is r1.75""? explain.
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what effect will the neglect of the heat capacity of the apparatus have on your calculated h values?
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the electrons in a tv picture tube are accelerated from rest through a potential difference of 25kv. What is the speed of the electrons after they have been accelerated by this potential difference?
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(b) if the titrant has a molarity of 0.2250 m and there are 30.00 ml of analyte present, what is the molarity of the analyte?
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a) Find the distance the load will rise if the pulley is rotated 1530. Find the exact distance in terms of and then round to the nearest tenth of a foot.b) Through how many degrees should the pulley rotate to lift the load 88 ft ? Round to the nearest degree.
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