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Lucy and her bike together have a mass of 120 kg she slows down from 4.5m/s to 3.5 m/s how much kinetic energy does she lose
a. A proton (q=+5x10-19C) is injected from right to left into a field B of 0.5 T directed toward the upper side of a sheet of paper. If the velocity of the proton is of 4x106m/s, find the magnitude and direction of the magnetic force over the proton.
b. A wire 50 cm long conducts a current of 1A forming an angle of 35° to the north of a magnetic field directed toward east. Find the magnitude of the magnetic field so that a force of 17N can be exerted over the wire. Find the direction of the force.
a) A wire 40 cm long conducts a current of 2A perpendicular to the direction of a magnetic field B=0.25T. Find the magnetic force over the wire.
b) An alpha particle (+2e) its projected into a magnetic field of 0.14T with a velocity of 3.9x106m/s. Find the magnetic force over the charge at the instant in which the direction of its velocity forms an angle of 55° with respect to the magnetic flux.
a) A proton in a particle accelerator has a speed of 4.0 x 106 m/s. The proton encounters a magnetic field whose magnitude is 0.50T and whose direction makes an angle of 20o with respect to the proton's velocity. Find the magnitude and direction of the magnetic force on the proton.
a) A beam of protons moves at 3.0 x 105 m/s through a uniform magnetic field with magnitude 2.0 T and whose direction makes an angle of 32o with respect to the proton's velocity. Find the velocity and magnitude of the force on the proton.
b) What is the maximum force on an aluminum rod with a 0.2μC charge that is crossed between the poles of a 2.5T permanent magnet at a speed of 6m/s? In what direction is the force?
a) An electron moving at 5 x 103 m/s in a 1.5T magnetic field experiences a magnetic force of 1.6× 10−16N. What angle does the velocity of the electron make with the magnetic field?
b) A cosmic ray proton moving toward the earth at 5 x 107 m/s experiences a magnetic force of 1.70 × 10 −16N. What is the strength of the magnetic field if there is a 45° angle between it and the proton’s velocity?
A 19.8 kg block is dragged over a rough, hor izontal surface by a constant force of 174 N acting at an angle of 25.8° above the horizon tal . The block is displaced 63.9 m, and the coefficient of kinetic friction is 0.123 .
A steel railroad track has length of 30m when the temperature is 0 degrees (a) when the temperature is 40 degrees, what is it’s length. (b) if the end of the rail are rigidly clamped at 0.0 degrees so that the expansion is prevented, what is the thermal stress set up if the rail is raised to 40 degrees
A capillary tube with an inside diameter of 𝟓𝟒𝟎 𝝁𝒎 can support a 𝟏𝟎𝟎 𝒎𝒎 column of liquid that has a density of 𝟏𝟑𝟓𝟎𝟎 𝒌𝒈𝒎−𝟑 . If 𝒉 = 𝟎. 𝟏 then is it possible to find the surface tension of the liquid? If not, then write down the reason
The equivalent resistance of two resistors R1 and R2 is given by Req = R1 + R2 and Req =R1R2/R1+R2
when they are connected in series and parallel respectively. If R1 = 22.0 Ω ±
5% and R2 = 47.0 ± 5% , find the maximum error in the calculation of their equivalent
resistance when they are connected in series and parallel.
