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What volume of helium is needed if a balloon is to lift a load of 180 kg (including the weight of the empty balloon)? the density of the air is 1.29 kg/m3 and the density of helium is 0.18 kg/m3?
You have two capacitors: C1=410 nF and C2=260nF and a DC battery (Vbatt=9.00 volts). The two capacitors are connected to the battery in a series.
The intensity level of an orchestra is 82 dB. A single violin achieves a level of 70 dB. How does the intensity of the sound of the full orchestra compare with that of the violin’s sound? In other words, find the ratio.
A person with mass m1 = 52 kg stands at the left end of a uniform beam with mass m2 = 109 kg and a length L = 3.1 m. What is the location of the center of mass of the system
a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incline
Household wiring made of aluminum wire with cross-section area 3.1 x 10^-6 m^2 carries a current of 4.5 A. what is the power loss over 5.2 m of wire
A pendulum bob with mass of 3.0 kg is suspended from an ideal string a distance of 3.5 m from the ceiling. A 0.004 kg bullet is fired horizontally at a speed of 6.91x103 m/s and imbeds itself in the bob.
If the shear stress in steel exceeds about 3.92 × 108 N/m2 , the steel ruptures. Find the shearing force necessary to shear a steel bolt 0.91 cm in diameter
A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 26.0 m/s. At what height above the cannon should the net be placed in order to catch the daredevil
In this section assume the temperature is 20unless directed otherwise. A submarine 47 deep emits a sonar (sound) wave. How deep is the ocean at that point
A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced slits, What is the wavelength of light produced by the pointer
Suppose a 76 kg person hangs vertically from a nylon rope. What radius must the rope have if its fractional enhancement in length is to be the similar as that of the spider's thread.
rod of length 56.0 cm and mass 2.30 kg is suspended by two strings which are 40.0 cm long, one at each end of the rod. Find the magnitude of the initial acceleration of the end B
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