If an electron is moving in the direction of the magnetic field lines...
A) It feels a magnetic force parallel to the magnetic field and gains no kinetic energy.
B) It feels a magnetic force perpendicular to the magnetic field and gains kinetic energy.
C) It feels no magnetic force but gains kinetic energy.
D) It feels no magnetic force but gains...
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24 mins ago
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An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic interaction. No other forces are present. Which of the following statements is true?
e= 1.6 x 10^-19 C, mass of proton = 1.67 x 10^-27 kg, mass of electron = 9.11 x 10-31 kg
A) The net force on the proton is smaller than the...
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39 mins ago
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What's the energy of one photon of ultraviolet light with a frequency of 4306000000000000 Hz in J?
What's the energy of one mole photons of ultraviolet light with a frequency of 4306000000000000 Hz in KJ mol-1
Can somebody help me with this because i don't know what to do with the frequency. Thanks
4 hours ago
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Let's say there is a source of sound next to the opened end of cylinder - there is incoming wave, and it interferes with reclected one - it leads to standing wave - node localized in "closed end" and antinode in "opened end". My question is - incoming wave has amplitude A, point of antinode has amplitude 2A, and it creates...
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5 hours ago
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The first asteroid has mass of 30 ✕ 103 kg and is initially moving at 830 m/s. The second asteroid has mass of 45 ✕ 103 kg and is moving at 1,040 m/s. Their initial velocities made an angle of 20° with respect to each other. What is the final speed (in m/s) and direction (in degrees) with respect to the initial velocity of the first asteroid?
9 hours ago
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A figure skater begins spinning counterclockwise
at an angular speed of 4.2 π rad/s. During
a 5.0 s interval, she slowly pulls her arms
inward and finally spins at 7.7 π rad/s
What is her average angular acceleration
during this time interval?
Answer in units of rad/s
11 hours ago
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The photo attached gives the question.
Part a I used PV=nRT and solved for n with…
(1.013x10^5 Pa)(0.1m^3) / (8.31)(293.15K) = 0.042 mol
Then Vrms = √((3kt)/m)
√((3)(1.38x10^(-23) J/K)(293.15K) / 1.67x10^(-27) kg) = 2696 m/s
Part b involved pressure related to temperature, Pi/Ti = Pf/Tf with Tf being 373.15 K
1013x10^5 Pa / 293.15 K = Pf / 373.15...
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12 hours ago
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Before impact, ball 1 was moving at a speed of 2.25 m/s, and after impact it is moving at 0.45 m/s at 55° counterclockwise from the direction of the initial velocity. If the two balls have equal masses of 160 g, what is the velocity of ball 2 after the impact? (Assume ball 1 initially moves along the +x-axis. Enter the magnitude in m/s and the...
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12 hours ago
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Two cars approach an extremely icy four-way perpendicular intersection. Car A travels northward at 19 m/s and car B is traveling eastward. They collide and stick together, traveling at 37.2° north of east. What was the initial velocity of car B (in m/s)? (Enter the magnitude. Assume the masses of the cars are equal.)
12 hours ago
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with a 28.0 N/m force constant that is at its equilibrium length. A 0.0600 kg wad of Play-Doh is thrown horizontally at the block with a speed of 3.00 m/s and sticks to it. Determine the amount by which the Play-Doh-block system compresses the spring. (in cm)
13 hours ago
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Fido immediately starts running between his spot and Cris at a speed of 3 m/s. Treating Fido’s turns as taking negligible time, find f(n), the distance Fido has run after returning to his spot n times.
14 hours ago
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Find mass and center of mass of the cylinder x^2 + y^2 = a^2 0<=z<=2 with density p(x,y,z) = 1+z.
So we know that the center of mass over xy plane would be at the origin (0,0,?) so we only need to find the z coordinate of center of mass.
z coordinate of center of mass is given by Mxy/m, where Mxy = ∬ z rho(x,y,z) dS
Im confused how i...
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14 hours ago
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Consider a particle moving in the xy-plane according to the trajectory √√√
r(t)=( t, 2− t) fort≥0.
At some time t0, the particle reaches the unit circle x2 + y2 = 1. What is t0? Show that at time t0, the path r(t) is tangent to the unit circle. Suppose that starting from the time t0, the particle begins to move along the unit circle, with constant...
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15 hours ago
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