• If an electron is moving in the direction of the magnetic field lines?

    Your answer: 
    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... show more
    24 mins ago
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  • Physics question nuclear potential?

    Your answer: 
    The tsar bomba was detonated in 1960. How much of it’s mass was converted to thermal energy? SHOW WORK PLEASE
    28 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.?

    Your answer: 
    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... show more
    39 mins ago
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  • Does stress affect the atoms in your body?

    Your answer: 
    2 hours ago
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  • Calculating energy in joules and kj mol-1?

    Your answer: 
    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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  • Acoustic resonance, sound wave and energy?

    Your answer: 
    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... show more
    5 hours ago
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  • Physics...capacitors...bleh?

    Your answer: 
    There are two capacitors in series, each of 8.5e−5 F. What is their equivalent capacitance?
    7 hours ago
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  • Two asteroids collide and stick together.?

    Your answer: 
    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 bowling ball has a mass of 1.4 kg, a moment of inertia of 0.103544 kg · m2 , and a radius of 0.43 m.?

    Your answer: 
    It rolls along the lane without slipping at a linear speed of 3.2 m/s. What is the total kinetic energy of the rolling ball? Answer in units of J.
    11 hours ago
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  • Racing car travels on a circular track of radius 311 m moving with a constant linear speed of 62.8 m/s Find angular speed Answer in rad/s?

    Your answer: 
    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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  • Physics Help! Momentum, PV=nRT, inertia, center of mass, root means square, and I think some other topics are involved.?

    Your answer: 
    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... show more
    12 hours ago
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  • A billiard ball moving horizontally, labeled 1, strikes another billiard ball at rest, labeled 2.?

    Your answer: 
    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... show more
    12 hours ago
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  • Physics help?

    Your answer: 
    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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  • A 0.360 kg block of wood rests on a horizontal frictionless surface and is attached to a spring (also horizontal)?

    Your answer: 
    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 is sitting on his favorite spot on a straight path. Cris, who is 1 meter away, starts walking along the path at a speed of 1 m/s.?

    Your answer: 
    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 on a surface that represents a thin shell with desity p? Find mass and center of mass of the cylinder x^2...?

    Your answer: 
    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... show more
    14 hours ago
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  • Calc 3 question is giving me hell guys. Help please?

    Your answer: 
    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... show more
    15 hours ago
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  • Physics momentum question help.?

    Your answer: 
    mv-mv should give 0.6kgms^-1, but the markscheme says it is -0.6. It must be a mistake right? It's june 2016 edexcel paper. 8PHO/01.
    16 hours ago
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