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A boat is heading upstream when a float is dropped overboard and carried downstream. After 1 hour, when the boat has traveled to a point 2.0 km farther upstream, it turned around and caught up with the float 8.0 km downstream from the turnaround point. If the boat is traveling with constant speed throughout the journey,
(a) How fast is the river flowing?
(b) What is the boat's speed in still water?
A student sits on a rotating stool holding two 3kg objects. When his arms are extended horizontally, the objects are 1m from the axis of rotation.
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 17.0 m/s. With what speed and angle of impact does the stone land
A glass capillary tube with a diameter of 8.5 mm and length 16 cm is filled with a salt solution with a resistivity of 3.4 ?m. What is the resistance?
The ball sinks to the point where none of it extends out of the water and remains submerged such that the child does not sink. The child has a mass of 36 kg. What is the diameter of the ball? Suppose for this problem that the ball has negligible m..
What total impulse was imparted by these forces. Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. Find the current density of these protons.
Find the distance from the origin on the x-axis between the charges where the electric potential due to the two point charges vanishes
An 8.3kg crate is pulled 4.9m up a 30? incline by a rope angled 19? above the incline. What is the increase in thermal energy of the crate and incline
How does hydrogen bonding affect large molecules like proteins? What shapes do proteins take because of this effect?
A 65Kg ice skater pushes off his partner and accelerates backwards at 1.3m/s^2. If the partner accelerates in the opposite direction at 2.0m/s^2, what is mass of the other skater.
What is the longest wavelength of light capable of ionizing a hydrogen atom in the n = 2 state
You are using a standard microscope with a 0.10NA 4x objective and switch to a 0.65NA 40x objective. What are the acceptance angles for each
Calcualte the radiation dosage (in rads) for a 67-kg person that is exposed to 6.0 seconds to a 3.0 Ci source of beta radiation.
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