Recent content by luysion

Gibbs free energy and Gibbs Free energy under standard conditions; Hi. Is a value of Gibbs free energy (delta G) and Gibbs free energy Under standard conditions (delta G knot) the same if they are both calculated under the same temperature (298K)? cheers

Cheers for the reply guys, Um, i meant C as in heat capacity and c as in specific heat (c=C/m) the mass was given as 2kg

hey for this question If a 2kg sample of aluminium absorbs 64.4 kJ of heat from its surrounds by how much does its temperature increase the answer is 65.1 how? i got 32.5 q=mcT T=q/mc=(64.6x10^3)/(2000x.9930) also same for this question If 0.5g of an organic compound is completely...

Homework Statement An 85kg yachtsman falls out of his boat into the cold ocean waters. He begins to loose body heat through a 0.02m thick layer of surface fat. The surface heat transfer coefficient between his skin and the sea water is 30. The total surface area of the yachtsman is 2.2 and...

fmax = frictional force can someone please show me how to do this its bugging the crap out of me, sonic91 arent the forces acting on the box friction and the normal reaction mintea; the normal reaction is angles because of the inclination, so the upwards force on the box i.e. that acts...

Homework Statement A 10 kg box is being pushed up a slippery ramp as shown in Figure 2.1. The coefficient of friction between the box and the ramp is just μ = 0.1. (a) What force does the man need to apply to the box to keep it traveling up the ramp at a steady speed?Homework Equations I have...

sorry i typed it wrong haha 7.5 is the final vertical velocity 2.5 is the initial

Homework Statement A tennis ball is hit down at an angle of 30° below the horizontal from a height of 2 m. It is initially traveling at 5.0 m s−1. What is the velocity of the ball when it hits the ground if we can neglect air resistance?Homework Equations The Attempt at a Solution ok so I...

Homework Statement A uniform 10 m long, 50 kg pole is lying on the ground. You get your little brother to lift at one end with an upward force of 100 N. How far from the other end will you need to lift so the pole stays horizontal (in m)? [Hint: Using your little brother as the fulcrum, what...

Homework Statement A 0.3 m long tube is filled with sterile solution of density 1037 kg m-3 and closed at the top. The tube is tilted at 40°. to the horizontal. The gauge pressure at the base of the tube is 3000 Pa. What is the gauge pressure at the top of the tube (in Pa)? Homework...

Homework Statement A plane is traveling from City A to City B which is 1000km due NORTH of city A. The plane has a maximum speed of 250km/hr in still air. If a wind is blowing due east at 150km/hr what is the shortest time for the plane to complete the journey A to B (in hours) a)3.4 b)4.0...

Homework Statement When an athlete throws a javelin her forearm snaps through an angle of approximately ¼ radians in 0.20 s. The athlete’s hand moves with approximately constant speed, the length of her forearm is 45 cm, and the combined mass of her forearm and javelin is 2.0 kg. Assuming...

Homework Statement Two buoys are floating in the sea, separated by 5 m. A wave with a wavelength of 15 m travels from left to right along the line between the buoys. The left-most buoy moves vertically up and down as described by the equation y=Acos(ωt). Which equation best describes the...

Homework Statement Car A, which is traveling at a constant velocity of 15 ms-1, passes Car B, which is stationary, at time t = 0. At the instant that it is being passed, Car B begins to move, accelerating at a constant rate of 0.1 ms-2 in the direction in which Car A is travelling. At what...

Cheers I get it now. But I am sort of confused now about this. Every action force has an equal and opposite reaction force right? But the reaction force never acts in the same body as the action. In this case wasnt the weight force the action force? and the upward normal reaction the reaction...