can some1 plz recheck my answers
n n
maths
v h vhv g g
Science
Each student is pulling with a force of 10 newtons
chemistry
So I would assume that the answer would be (-393.5)-(0)= -393.5 However, the problem lists the compound heat of formation for water also, which makes me think I have the wrong balanced equation up top, but at the same time no type of coal is specified, so there is no way to kn...
chemistry
From the following information, calculate the standard change of enthalpy for the combustion of coal. C + O2 -> CO2 COMPOUND HEAT OF FORMATION coal 0.0 carbon dioxide -393.5 water (l) -285.9 oxygen 0.0
Physics
When I follow your steps I get 1284 cm/s, so I'm not sure how you're getting 2.08 m/s. What gravitational potential energy term are you referring to?
Physics
A 100-g block hangs from a spring with k = 5.2 N/m. At t = 0 s, the block is 20.0 cm below the equilibrium position and moving upward with a speed of 216 cm/s. What is the block's speed when the displacement from equilibrium is 27.0 cm? The answer is 172 cm/s; but I cannot...
Physics
How did you go from -(104+64)g*1 + 64gL to L=168/64? When I sum the forces of -(104+64)g*1 + 64gL, I get 3060.72.
Physics
A wooden plank with length L = 7.5 m and mass M = 104 kg is centered on a granite cube with side S = 2.0 m. A person of mass m = 64 kg begins walking from the center of the plank outward, as shown in the figure. How far from the center of the plank does the person get before t...
chemistry
50.00 mL of OOH was diluted to 250.0 mL with deionized water. In the determination of the total cation concentration, 25.00 mL aliquots of the dilute OOH were passed through a cation exchange column and the eluent titrated with an average 27.42 mL of 0.1134 M NaOH. In the dete...
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