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Let W be the amount of water, in gallons, in a bathtub at time t, in minutes.
(a) What are the meaning and units of dW/dt?
(b) Suppose the bathtub is full of water at time t0, so that W(t0) > 0. Subsequently, at time tp > t0, the plug is pulled. Is dW/dt positive, negative, or zero:
(i) For t0 p?
(ii) After the plug is pulled, but before the tub is empty?
(iii) When all the water has drained from the tub?
Which two particles that make up atoms have about the same mass? Which two have the same magnitude of electric charge? What is an electric current, and what are its units? (Give two equivalent units.)
A ship travels 50.0 mi on a course of 15 degrees south of east and then travels 85.5mi on a course 60.0 degrees west of south. Find the displacement from its starting point
A system is acte on by its suroundings in such as way that is receives 50 J of heat while doing 20 J of work. What is its net change in internal energy?
A solid sphere of radius = 10 cm and mass = 2 kg is going down an inclined plane of height = 5 m. The angle of the inclined plane = 35 degrees. What is the final Total kinetic energy of the sphere
A new circus act is called the Texas Tumblers. Lovely Mary Belle swings from a trapeze, projects herself at an angle of 53, and is supposed to be caught by Joe Bob, whose hands are 6.10 above and 8.02 horizontally from her launch point. You can ignor..
An object is made of glass and has the shape of a cube 0.12 m on a side, according to an observer at rest relative to it. However, an observer moving at high speed parallel to one of the object's edges and knowing that the object's mass is 2.8 kg ..
A girl makes a microscope with a 3.0 cm focal length objective and a 5.0 cm eyepiece. the microscope tube length is 10 cm. Find expected magnification of this microscope
A mass M = 95.0 kg is suspended by a massless string from the ceiling of a van which is moving with constant acceleration a, what is the acceleration a of the van
A rock is tossed straight up with a velocity of 34.5 m/s. When it returns, it falls into a hole 17.1 meter deep. Find is the rock velocity as it hits the bottom of the hole
A 1.55 kilogram block slides across a rough surface such that it slows down with an acceleration of1.10 m/s2. Obtain coefficient of kinetic friction between block and surface
Zinc has a work function of 4.30 eV. A 4.80 eV photon strikes the surface and an electron is emitted. What is the maximum possible speed of the electron
When its engine of power 76 kW is generating full power, a small single-engine airplane with mass 680 kg gains altitude at a rate of 2.8 m/s. What fraction of the engine power is being used to make the airplane climb
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