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1. Estimate the rate of speed (length per time) at which the hair on your head grows. Use your own experience as a guide for your answer. First express your estimate in inches per second and then in meters per second. Use scientific notation. 2. a) How many seconds are there in a year? b) If one micrometeorite (a cube with sides on the order of 1 μm) struck each square meter of the Moon each second, estimate the number of years it would take to cover the Moon with micrometeorites to a depth of one meter. Hint: Consider a cubic box, 1 m on a side, on the Moon, and find how long it would take to fill the box.
An airplane, whose air speed is 380 km/hr, is supposed to fly in a straight line 23.0 degrees north of due east. A steady 100 km/hr is blowing from the north. Illustrate in what direction should the plane head realative to the earth?
Electromagnets that produce large magentic fields use water cooling to prevent excessive heating of the magnet's coils. How many liters of water must circulate by the coils each second if the temperature of the coils is not to exceed 49°C
Using a vernier caliper of least count 0.01 cm, the length of a cylinder is measured to be 3.76 cm, and its diameter 1.28 cm. Find the volume of the cylinder. Calculate the probable percent error in the length. Calculate the probable percent error..
We compared two cases: single phase delivery (call the wasted power P1), and 2-phase delivery (P2), Find the ratio P1/P2 when load 1 = 3.1 A, load 2 = 7.4 A, and each delivery wire has a resistance of 0.25 ohm
An airplane is making a turn with a given radius in a circle. The lift force (given) is exerted perpendicular to the wings. What is the angle that the wings make with the horizontal
What is the intensity of the sound waves at point.
A 1.5 kg copper block is given an initial speed of 3 m/s on a rough horizontal surface. Because of friction, the block finally comes to test. If the block absorbs 85% of its kinetic energy, calculate its increase in temperature.
A piece of copper wire is formed into a single circular loop of radius 10 cm. A magnetic field is oriented parallel to the normal to the loop, find the average electrical energy dissipated in the resistance of the wire
What is the electric potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)" Use = 8.85 10 12 for the permittivity of free space.
A parallel-plate capacitor has square plates 20 cm on a side and 0.50 cm apart. what is the displacement current in the capacitor
A certain type of molecule has an excited energy states, plus the minimum energy ground state. what is the energy of the ground state
A projectile is launched perpendicularly upward from a planet of mass M; and radius R; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.
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