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Under standard conditions, the density of air is 1.293 kg/m3 and that of helium is 0.178 kg/m3. A spherical helium balloon lifts a basket plus cargo of mass 256.0 kg. What must be the minimum diameter of the spherical balloon?
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In chemical changes, new substances are formed. Do the atoms involved actually change? If not, what has changed? How would you help your students visualize this?
Question: A skier is accelerating down a 30.0 degree hill at 1.80 m/s2. What is the vertical component of her acceleration? How long will it take her to reach the bottom of the hill, assuming she starts from rest and acc ...
Question: A proton with an initial speed of 600,000 m/s is brought to rest by an electric field. What was the potential difference that stopped the proton? What was the initial kinetic energy of the proton, in electron v ...
Can you please explain how to get an answer for this question and what formula to use step by step and why. "In a race you first ride a bicycle at an anverage speed of 18.4 mi/h for 19.5 miles, then you must run for anot ...
Question: Tim and Rick both can run at speed v_r and walk at speed v_w, with v_r > v_w They set off together on a journey of distance D. Rick walks half of the distance and runs the other half. Tim walks half of the time ...
Questin: A research submarine has a 30-cm-diameter window that is 9.0cm thick. The manufacturer says the window can withstand forces up to 1.2*10^6N . What is the submarine's maximum safe depth in salt water? The pressur ...
Question: A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 0.0060 m/s2 less than that at sea level (gsealevel = 9.83 m/s2). Part A: What is the observatory's altitude? Assume Rear ...
Question: The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 30 m radius of curvature. What is the car's speed at the bottom of the dip? The response must ...
Question: A small 100 g cart is moving at 1.20 m/s on a friction less track when it collides with a larger, 1.00 kg cart at rest. After the collision, the small cart recoils at 0.850 m/s. What is the speed of the large c ...
Question: (a) Is the magnetic field created by a current loop uniform?Explain. (b) Does a wire connected to the terminals of abattery emit electromagnetic waves? Explain. (c) Why do astronomers looking at distant galaxie ...
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