Master Physics with Fun Quizzes & Brain Teasers!

A capacitor 0.2F is charged to 600V. After removing the battery, it is connected to 1F capacitor in parallel. The voltage across 1F will become
1 Answer
fort20, the velocity ofaparticle moving along the x-axis is given by v(t)=t- 6t 10t4. at what timetdoes the direction of motion of the particle change from right to left?
1 Answer
write an equation for the line tangent to the graph of a at t=10. use the tangent line to approximate the number of pounds of salt in the vat at time t=12 minutes.
1 Answer
if the voltage drop is less than 0.5 volts, then measure the voltage drop on the starter ground circuit.
1 Answer
An electron travels with speed 1.3107m/s between the two parallel charged plates shown in the figure(Figure 1) . The plates are separated by 1.0 cm and are charged by a 200 V battery.What magnetic field strength will allow the electron to pass between the plates without being deflected?What is the direction of the magnetic field?
1 Answer
the molar extinction coefficient () for bsa: 43,824 cm-1m-1 (absorbance max at 280 nm)
1 Answer
using the lennard-jones potential, calculate the ratio of the cohesive energies of neon in the bcc and fcc structures (ans. 0.958). the lattice sums for the bcc structures are
1 Answer
(a) approximate the threshold voltage vt of the mosfet by finding the value of vgs which just starts to produce a non-zero drain current.
1 Answer
find the radius of convergence, r, of the series. [infinity] (1)n n2xn 7n n = 1
1 Answer
find a vector parametric equation () for the circle that starts at the point (9,0) and travels around the circle once counterclockwise for 02
1 Answer
The saturated vapour pressure at 20C and 8C is 17.54mmHg and 8.05mmHg respectively. Find,(i) Relative humidity at the room temperature.(ii) How much mass of water should evapourate such that it saturate at 20C (1mmHg = 133.3Pa)
1 Answer
The flywheel rotates with an angular velocity of omega = (0.00502) rad/s, where theta is in radians. Determine the angular acceleration when it has rotated 20
1 Answer
a student conducts an experiment to test the relationship between the net torque exerted on an object and the change in angular momentum of the object. a variable net torque is exerted on the object to make it rotate about its internal axis. data from the experiment are used to construct a graph of the net torque exerted on the object as a function of time, as shown in figure 1. a graph is also created of the angular momentum of the object as a function of time, as shown in figure 2. which of the following statements about the change in the object's angular momentum for a given time interval is correct? justify your selection.
1 Answer
A(n) 1 mm radius superconductor carries a 2517.2 A of current.What is the magnetic field at the surface?1. 0.1479552. 0.2988383. 0.2507494. 0.3777485. 0.3169266. 0.3637517. 0.3098278. 0.1405559. 0.25708610. 0.504787Answer in units of T.
1 Answer
A 5 kg block is moving at v0 = 6 m/s along a frictionless, horizontal surface toward a spring with force constant k = 500 N/m that is attached to a wall. (a) Find the maximum distance that the spring will be compressed. (b) If the spring is to be compressed no more than 0.15 m, what is the maximum value of v0.
1 Answer
at what speed relative to a laboratory does a clock tick at one quarter the rate of an identical clock at rest in the laboratory? give your answer as a fraction of c .
1 Answer
the osmotic pressure of a solution formed by dissolving 65.0 mg of aspirin c9h8o4 in 0.250 l of water at 25c is ________ atm.
1 Answer
the density of a pure gas at stp depends on its
1 Answer
assume you have a 180-step stepper motor. what is the step angle in degrees?
1 Answer
a sample of gold (rho = 19.32 g/cm), with a mass of 40.69 g, is pressed into a leaf of 1.000 m thickness, what is the area of the leaf?
1 Answer
what is the thinnest film of mgf2 ( n = 1.39 ) on glass that produces a strong reflection for orange light with a wavelength of 615 nm ? express your answer with the appropriate units.
1 Answer
an electromagnetic wave propagates in the y direction and the magnetic field oscillates parallel to the x axis the wavelength of the wave is 25 nm and the amplitude of the oscillation is 0.0015t which of the following equations best describes the magnetic field as a function of time at a particular position
1 Answer
When a pendulum is pulled back from its equilibrium position by 10, the restoring force is 1.0 N. When it is pulled back to 30, the force increases to 2.8 N Part B Explain why its motion is not simple harmonic. Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer frequency, linear, amplitude, triples, does not triple Simple harmonic motion means that there is a single __________ independent of __________. Since tripling the angular displacement __________ the restoring force, the constant described scenario is outside the small-angle regime where the restoring force is assumed to be __________. and in which the motion is approximately simple harmonic.
1 Answer
A 2.0 x 10^ -3 V/m electric field creates a 3.5 x 10^17 electrons/scurrent in a 1.0-mm-diameter aluminum wire. What are (a) the driftspeed and (b) the mean time between collisionsfor electrons in this wire?
1 Answer