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Calculate the force a mother must exert to hold her 12.0 kg child in an elevator accelerates upward at 0.850 m/s2
When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert
Determine the energy of 1.20mol of photons for each of the following kinds of light. (Assume three significant figures.) infrared radiation (1480nm) visible light (520nm) ultraviolet radiation (130n
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5.
Two spheres are launched horizontally from a1.0m -high table. Sphere A is launched with an initial speed of 5.0m/s. What is the time for the sphere A to hit the floor
Block A weighs 40-lb. Block B weighs 80-lb. The coefficient of friction between both blocks and the surface is µ=0.3. Determine how far B travels before it stops
Consider the combustion of glucose (C6H12O6). This reaction is 1. spontaneous at all temperatures 2. non-spontaneous towards lower temperatures 3. non-spontaneous at all temperatures 4. spontaneous
On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. What is the total kinetic energy of the two blocks after the collision (in joules)
Radical chlorination of 2-bromopropane produces all possible monochlorinated products. How many constitutional isomers are formed. How many of these constitutional isomers are chiral
A positively charged particle of mass 6.80 10-8 kg is traveling due east with a speed of 25 m/s and enters a 0.32-T uniform magnetic field. What is the magnitude of the magnetic force acting on the
A 266 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. Find the tension in the rope
what happens to the entropy of the system upon opening the valve between the flasks? 1. The entropy remains the same. 2. There is too little information to assess the change. 3. The entropy decrease
A kaon is moving in the +x direction decays by this process, where that pi^+ is moving off at a speed of 0.9c in the +x-direction, determine the speed of the kaon before the decay
How many grams of the products are produced by the oxidation of C7H14O3 by potassium permanganate in acidic solution (HCl is the acid) when you start with 25.65494 g of C7H14O2 and stoichiometric am
A particle moving at a speed of 0.92c is observed to have a mass of m=1682 MeV/c^2. Determine the rest mass Mo of the particle in kg
A radioactive atom is moving with respect to the laboratory (which is the Earth frame) at the speed of 0.8c in the +x direction. determine the velocity of the electron measured by a laboratory observe
A solenoid is wound with a single layer of insulated copper wire of diameter 2.000 mm and has a diameter of 5.000 cm and is 1.800 m long. How many turns are on the solenoid
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium. Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC. Give your answer wit
A parallel-plate capacitor has plates of area 114.0 cm2 and a separation of 1.45 cm. A battery charges the plates to a potential difference of 177.0 V, What is the capacitance with the slab in place
An initially stationary 1.3 kg object accelerates horizontally and uniformly to a speed of 17 m/s in 3.0 s. What is the instantaneous power due to that force
A parallel-plate capacitor has plates with an area of 395 cm2 and an air-filled gap between the plates that is 2.29 mm thick. How much energy is stored in the capacitor
If this amount were shaped into a cube, what would be the length of one edge of that cube (in meters)
Two isomeric compounds, A and B, are known to each have a monosubstituted benzene ring. Both have the formula C9H10O2 and both are insoluble in water. However, A dissolves in dilute aqueous NaOH, bu
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. What is her useful power output
A 200-m-wide river flows due east at a uniform speed of 4.5m/s. A boat with a speed of 9.0m/s relative to the water leaves the south bank pointed in a direction 28o west of north. How long does it t