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A spherical hydrogen-filled balloon is used to lift a load of 5705 N (in addition to the weight of the hydrogen). Suppose the density of the air is 1.21 kg/m3. Find the minumum necessary radius for the balloon.
A pen contains a spring with a spring constant of 251 N/m. How much work is done by the spring force to ready the pen for writing
a piece of pure gold (density= 19.3g/cm^3) is suspected of having a hollow center. What is volume of the hollow center
A sphere of radius R = 0.325 m and uniform charge density -151 nC/m3 lies at the center of a spherical, find the magnitude of the electric field at the following radial distances from the center of the charge distribution
Recently we were padding on a boat in a sea. Surprisingly we saw gleaming points in water during padding. Would you explain about this.
An extreme skier, starting from rest, coasts down a mountain that makes an angle 25.0° with the horizontal. How fast is she going just before she lands
A tank having a volume of 0.100 m3 contains helium gas at 135 atm. How many balloons can the tank blow up
An indoor swimming pool of depth 2m transfers heat at a rate of 100w/m2 to the 10m of air between the pool and the roof for 1000s. What is the temperature change of the air
The average density of the planet Mercury is 5510 kg/m3. The acceleration of gravity on its surface is 3.73 m/s2. Calculate the average radius of Mercury
A rectangular loop of wire enter a 2.0 T magnetic field with velocity of 10 m/s, find the direction of the force experience by the wire
An object is found to have a weight in air of 500N. It is then tied to a string connected to a balance and immersed in water (density of water is 1000 kg/m3). The scale now reads 450 N. at last the object is immersed in oil and is found to have a ..
A particle moving along the x axis in simple harmonic motion starts from its equilibrium position, the origin, at t = 0 and moves to the right. The amplitude of its motion is 1.70 cm and the frequency is 1.30 Hz.
A shopper pushes a cart 44- m south down one aisle and then turns 90.0° west and moves 30 m. He then makes another 90° turn and moves 13 m.
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