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Brian

Questions11

• What is the pressure in the flowing water at the left end of the pipe if the water behaves as specified below?

A 1.8-m length of horizontal pipe has a radius of 6.20 10-3 m. Water within the pipe flows with a volume flow rate of 1.00 10-2 m3/s out of the right end of the pipe and into the air. What is the pressure in the flowing water at the left end of the pipe if the water behaves as specified below?

A) As an ideal fluid

B) As a viscous fluid (η = 1.00 10-3 Pa · s)

• determine how much weight must be dropped overboard to make the balloon rise 109 m in 15.7 s?

A lighter-than-air balloon and its load of passengers and ballast are floating stationary above the earth. Ballast is weight (of negligible volume) that can be dropped overboard to make the balloon rise. The radius of this balloon is 6.52 m. Assuming a constant value of 1.29 kg/m3 for the density of air, determine how much weight must be dropped overboard to make the balloon rise 109 m in 15.7 s.

• The translational speed?

A bowling ball encounters a 0.760 m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 6.00 m/s at the bottom of the rise. Find the translational speed at the top.

• Nonconservative forces and work-energy?

A physics student shoves a .50-kg block from the bottom of a frictionless 30.0 degree inclined plane. The student performs 4.0 J of work and the block slides a distance along the incline before it stops. Find the value of s.

• Kinetic energy question?

A woman stands on the edge of a cliff an throws a stone vertically downward with an initial speed of 10m/s. The instant the stone hits the ground below, it as a 450J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed of 10m/s, how much kinetic energy would it have just before it hit the ground?

• What is the acceleration due to gravity at a height of 1.28 × 107 m above the earth's surface?

Given that the radius of the earth is 6.38 × 106 m and its mass is 5.98 × 1024 kg.

• Physics- Collisions Question?

A 45.0-kg skater is traveling due east at a speed of 2.95 m/s. A 65.5-kg skater is moving due south at a speed of 7.15 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find the following.

(a) the angle θ

(b) the speed vf, assuming that friction can be ignored

• Chemistry need help with equilibrium constant question and conjugate acid base pair question.?

11) The base dissociation equilibrium constant for cyanate (CNO-) is 4.57 × 10-11. What

is the pKa of cyanic acid (HCNO)?

A) 3.660

B) 10.340

C) 4.56 x 10-11

D) 7.45

E) 1.12

and

19) A solution of a mixture of nitrous acid (HNO2) and nitrite ion (NO2

-) is analyzed and

found to contain 0.9301 M nitrous acid and 0.0927 M nitrite. What is the pH of this

solution (the Ka of nitrous acid is 4.47 x 10-4)?

• dilution and molarity I have no clue?

12) A 275.0 mL portion of a concentrated stock NaCl solution was used to prepare 0.8880

L of 0.4700% w/v saline solution.

A) What was the concentration (in % w/v) of the stock solution?

B) What is the molarity of the stock solution?

C) What is the molarity of the (diluted) working solution?