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K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K40 decay in a 75 kg human.
Three capacitors of 2.0, 9.0, and 17.0 µF are joined together in parallel. What is their equivalent capacitance
Consider two vectors where F_1= 84 N, F_2 = 46 N, theta_1= 5 degrees, and theta_2 = 144 degrees, measured from the positive x axis with the counter-clockwise angular direction as positive. What is the magnitude of the resultant vector F = F_1 + F_..
A mass m slides down a frictionless plane that is inclined at angle θ. Show, using the method in Section 5.3, that the normal force from the plane is the familiar mg cos θ.
A wire carries current to the left in a region of space where there is a magnetic field directed upward. what is the direction of the magnet force on the wire?
question1a ball drops from rest from an unknown height h. the time it takes for the ball to hit the ground is measured
a vertical right circular cylindrical tank measures 30ft high and 20 ft in diameter. it is full of oil weighing 51.2
What is the rms current in an RL circuit when a 60.0Hz 240V rms ac voltage is applied, where R = 1.80k? , and L = 420mH?, What is the phase angle between voltage and current
A tornado Siren emits 3000 W of sound power, radialy equal in all directions. Assume the weakest sound likely to be heard over background noise is 55dB. What is the maximum distance the iran can be heard
A ski jumper starts from rest 50.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal, What is her speed when she leaves the track
a)What is its velocity b)The charged ion then enters a magnetic field, B = 0.20 T, perpendicular to the field. What is the radius of the particle's circular orbit in the field
Think an object that is in an elliptical orbit with semi major axis a = 7.4×106 m regarding a planet of mass M = 3.2×1023 kg. What is the speed of the object (a) When it is closest to the planet a tr = a/4? (b) When it is furthest from the planet?
a block slides down a friction less incline ramp. If the ramp angle is 15.0 deg and the length of it is 19.0 m, find the speed of the block as it reached the end of the ramp
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