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Suppose a crate of mass 8.4 kg is placed on the plank in the figure below at a distance x = 8.3 m from the left end. find the forces exerted by the two supports on the plank
A student at the top of a building throws a ball straight upward with an initial speed v0. How do the final velocities of the balls compare when they reach the ground
A Brayton-cycle heat engine follows the cycle shown in the figure. The heat input from the burning fuel is 2.0 MJ per cycle. Determine the engine's thermal efficiency by explicitly
The ionization constant or dissolution constant (KA) for acetic acid (HAc) is 1.8×10-5. (1) Write down the dissociation reaction. (2) Estimate pH of a solution containing 0.6 g of acetic acid
A group of students have measured the time it takes for a cart to travel some distance along a level track. What is the best estimate of the relative error in their determination of the cart´s s
The water skier there has a mass of 66.0 kg. Find the magnitude of the net force acting on the skier when she is accelerated from rest to a speed of 14.0 m/s in 9.20 s
For a metal salt (MX3) that has a Ksp value of 3.5 x 10-5, what is the delta G for the following reaction? M3+ + 3 X- <-> MX3(s)
A galvanometer has a coil resistance of 48.0 ?. It is to be made into a voltmeter with a full-scale deflection equal to 100.0 V. what size resistor should be placed in series with the galvanometer
The standard free energy change for N2O4(g) ? 2 NO2(g) is 5.4 kJ at 25oC. a) What is the equilibrium constant for this reaction? b) What is ?G if we set up the flask to start with 0.450 atm N2O4 and
The atmosphere of the sun consists mostly of hydrogen atoms (not molecules) at a temperature of 6000 K. What are the average translational kinetic energy per atom
What would you guess is the sign for the change in entropy for this reaction. b) What is the expected sign for the change in free energy for this reaction c) Finally, what is the expected sign for t
Determine the direction of a reaction in a solution containing initially 10-4M acetaldehyde, 0.1M ethanol, 0.1M pyruvate, and 10-2M lactate. What is the value of Gibbs' function for this reaction
A horizontal force of 200 N is applied to a 55-kg cart across a 10-m level surface. If the cart accelerates at m/s^2, then what is the work done by the force of friction
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.200 M sodium benzoate. How much of each solution should be mixed to prepare this buffer
Two identical cars (m = 1350 kg) are traveling at the same speed of 18.9 m/s. What is the magnitude of the total momentum of the two cars
What is the angle of incidence in air of a light ray whose angle of refraction in glass is half the angle of incidence? Assume the refractive index of glass is 1.50
A girl is using a rope to pull a box that weight 300 N across a level surface with constant velocity. what is the normal force of the floor on the box
A gas cylinder with a movable piston initially contains .25 moles of neon in a 5 L. If .5 moles of helium are added to this gas cylinder, what will be the final volume
A 100 kg crate is pushed at constant speed up the frictionless 31° ramp shown in the figure. What horizontal force F is required
The cranberry juice control is 27% juice when purchased from a local grocery store. Provide the calculations required to prepare the series of standard solutions of cranberry juice
A force accelerates a body of mass M. The same force applied to a second body produces three times the acceleration. what's the mass of the second body
A 15-kg block rests on a level frictionless surface and its attached by a light string to a 5.0-kg hanging mass, What is the tension in the connecting string
A pickle is made by soaking a cucumber in brine, a saltwater solution. What makes the smooth cucumber become wrinkled like a prune
The surface between a 12kg block , the 16kg wedge and between 16 kg wedge and the horizontal plane are smoothe, What is the force F which must be exerted on the 16 kg block in order that the 12 kg blo
4 lbm of water is in a volume of 10.0 ft3 at 60 psi. The water undergoes an isobaric change of state until the temperature is 500°F. Find the temperature at the initial state