Please help me 100 points for correct answers, answers without context will be reported 1. In the situation below, a tractor pulls the 850-kg sled along a ramp of height ℎ = 1 m and slope of θ = 30 °. If the tractor applies constant force on the sled T = 6750 N at an angle φ = 36.9 °, determine the total work done by all forces on the sled to move it along the ramp. The coefficient of kinetic friction between the sled and the plane is u = 0.3. Hint: For the calculation, remember that only the components of the forces parallel to the direction of travel contribute to the work. Disregard the dimensions of the sled.

2) When firing a 2 projectile at a 1.4 block, initially at rest, it is observed that the projectile wedges into the block and the system moves together for a distance = 0.1 before stopping. If the coefficient of kinetic friction between the block and the surface is = 0.25, determine what the velocity of the projectile was at the instant before impact. Hint: here you should use the conservation of linear momentum and also of energy, considering the work done by the frictional force.

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

What happens when chlorine reacts with bromine? a. electrons move from the chlorine atoms to the bromine atoms. b. electrons move from the bromine atoms to the chlorine atoms. c. electrons are shared between the chlorine atoms and the bromine atoms. d. electrons become delocalized among the atoms.

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law