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Assume that there is no friction between the sleds' runners and the snow surface. What is the tension in the rope that he is pulling?
A firefighter of mass 95 kg slides down a vertical pole with an acceleration of 4 m/s2. What is the friction force that acts on the firefighter?
How many milliliters of a stock solution of 6.80 M HNO3 would you have to use to prepare 0.150L of 0.470 M HNO3?
Starting from rest, a boat increases its speed to 3.56 m/s with constant acceleration. (a) What is the boat's average speed?
Explain why rubber stretches more than Teflon. Be specific about the structure of the polymer chains and the relevant forces.
Determine the mass percent ethanol in the sample used for the analysis. (The technician forgot to record the mass of the sample used in the analysis.
The temperature at 20 Km is 216 K and the surface is 288K. Assume that the balloon rises slowly so that the temperature inside is the same as outside. What will happen if the balloon is made up of r
In the first 15.0s of the reaction, 1.6×10-2mol of O2 is produced in a reaction vessel with a volume of 0.380L . What is the average rate of the reaction over this time interval?
Calculate the mass of AgNO3(s) that must be added to 0.500 L of a solution of 0.154 M NaCl solution to precipitate ‘all' of the chloride ion.
A 6500 kg helicopter accelerates upward at 0.60 m/s^2 while lifting a 1200 kg car. The car is suspended beneath the helicopter by a steel cable. What is the lift force exerted on the air by the heli
A 10.0 g object moving to the right at 21.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 32.0 cm/s. Find the velocity of each object after the co
To give a 21- child a ride, two teenagers pull on a 3.9- sled with ropes, as indicated in the figure . Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, whi
13.0 mL of 0.40M copper(II) sulfate react to form as much product as possible, how many millimoles (mmol) of the non-limiting reactant will remain unused at the end of the reaction?
A woman is pushing a piano up a ram at aconstant velocity that is 30 degrees above the horizon. the piano is 200 kg. the force she is applying is parralell to the Friction free incline
A loudspeaker of mass 19.0 kg is suspended a distance of h = 2.00m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l= 3.50m . What is the tension
A person can survive a feet-first impact at a speed of about 12m/s (27 m/h) on concrete; 15 m/s (34 m/h) on soil; and 34 m/s (76 m/h) on water. Why the different values for different surfaces?
Calculate the pressure (in pascals and atmospheres) exerted by a mass of 1.0 kg pressing through the point of a pin of area 1.0 x 10-2 mrrr' at the surface of the Earth. Hint. The force exerted by a
In the generation of polyurethanes (from diols and di-isocyanates), can you think of examples where use of less diol than diisocyanate might be a good idea?
A 2300 kg car moving east at 10.0 m/s collides with a 3000 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 47.0° north of east and at a speed
Amines react rather quickly with epoxy groups - how might you slow the reaction down to give your customer more time to apply the product? How might you speed it up?
An isolated conducting sphere has a 14 cm radius. One wire carries a current of 1.0000048 A into it while another wire carries a current of 1.0000000 A out of it. How long in seconds would it take f
Assuming that the door's center of gravity is at its center, find the horizontal components of force exerted on the door by each hinge.
Conducting rod is pulled horizontally with constant force F= 4.30 N along a set of rails separated by d= 0.480 m. A uniform magnetic field B= 0.800 T is directed into the page. There is no friction
Water flowing through a 2.0 cm diameter pipe can fill a 280 L bathtub in 5.0 minutes. What is the speed of the water in the pipe?
A gas mixture being used to simulate the atmosphere of another planet consists of 324 mg of methane, 217 mg of argon, and 228 mg of nitrogen.