Aflat coil of wire has an area a, n turns, and a resistance r. it is situated in a magnetic field, such that the normal to the coil is parallel to the magnetic field. the coil is then rotated through an angle of 90˚, so that the normal becomes perpendicular to the magnetic field. the coil has an area of 1.5 × 10-3 m2, 50 turns, and a resistance of 180 ω. during the time while it is rotating, a charge of 9.3 × 10-5 c flows in the coil. what is the magnitude of the magnetic field?

Player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 m/s. what is the horizontal velocity component of the ball to the nearest tenth of a m/s?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)