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Compare the intensity of a 100 W light while you are reading this book to the intensity of the sun. What assumptions were made?
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hz that can travel up to 10 km. The intensity level of these sounds can reach103dB, measured a distance of4.5m from the source. Determine the ..
A model rocket is constructed with a motor that can provide a total impulse of 29.0 Ns. The mass of the rocket is 0.175 kilogram. Find the speed that this rocket achieves
What is weight of the parachutist
On a roller coaster the first hill has a height of 30m while the second hill as a height of 15m. what is its speed at the top of the second hill
On a hot summer day, a young girl swings on a rope above the local swimming hole (Figure 1) . When she lets go of the rope her initial velocity is 2.20 at an angle of 35.0 above the horizontal.If she is in flight for 0.619 , how high above the water ..
A U.S. penny has a diameter of 1.9000cm at 20.0 C. The coin is made of a metal alloy (mostly zinc) for which the coefficient of linear expansion is 2.6x10^-5 K^-1. What would its diameter be on a hot day in Death Valley
The initial speed of a 2.81 kilogram box traveling up a plane inclined 37degree to the horizontal is 4.09 m/s. Determine its speed when it has traveled half the distance
A concave makeup mirror is designed so that aperson 23 cm in front of it seesan upright image magnified by a factor of two. What is the radius of curvature of the mirror in meters?
A laser beam passes during a slit of width1.0 cm and is pointed at the Moon, which is approximately380,000 {\rm km} from the Earth. Suppose the laser emits waves of wavelength 630 {\rm nm} (the red light of a He-Ne laser).
A ski gondola is connected to the top of a hill by a steel cable of length 680 m and diameter 1.5cm. As gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along cable. It is observed that it took 14 s for the p..
A 75 kg man jumps from an airplane. When his parachute deploys, it exerts a 500 N force on the man at an angle of 30 degrees with respect to vertical
One mole of an ideal gas expands from 5 to 1 atm at 25 oC. Calculate W (a) if the gas expands isothermally, (b) and if the gas expands adiabatically.
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