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A 1000kg elevator accelerates up a shaft at a rateof 2.0 m/s^{2}. The tension in the cable raising the elevator is?

A. 12 kN

B. 9.8 kN

C. 7.8 kN

D. 2.0 kN

Posted 3 years ago by **yasar** in Physics 20 | 5 answers

#tension

A team of 10 Qimmiq is pulling a komatik and its load having a total mass of 1000kg at a constant velocity of 8.1km/h over the frozen tundra. Calculate the coefficient of kinetic friction between the komatikand the snow if the dogs must exert a total force of 922N to keep the komatik travelling at a constant velocity?

Posted 3 years ago by **yasar** in Physics 20 | 6 answers

#friction

Can you please tell me the formula of density? I know it has D, M,V but how is it written?

Posted 3 years ago by **Lizneedshelp** in Science 10 | 7 answers

#single replacements reactions

To what extent do political processes in Canada meet the needs of all Canadians?

Posted 3 years ago by **Kaylawbu** in Social Studies Grades 7-9 | 6 answers

#thesis

Barium is what on the periodic

table

Posted 3 years ago by **Hannah1231** in Chemistry 20 | 6 answers

#periodic table

iron reacts with calcium sulfate

Posted 3 years ago by **hannah** in Science 10 | 3 answers

#single replacements reactions

A jet skier leaves a dock at 8 a.m. and travels due west at 36 km/h. A second jet skier leaves the same dock 10 min later and travels due south at 44 km/h. At what time of day, to the nearest minute, will the two jet skis be 20 km apart?

Posted 3 years ago by **mlodberg** in Math 20-2 | 5 answers

#quadratic equations

Bill and Ben are on a bridge, timing how long it takes stones they have dropped to hit the water below. A quadratic relation can be used to determine the distance, D, in metres, that ta stone will fall in the time, t, in seconds after it is realeased. In this relation, a = -0.5g, where g is acceleration due to gravity, which is approximately 9.8 m/s^{2} on Earth. Ben starts a timer when Bill releases a stone, and he stops the timer when the stone hits the water below. The mean time of serveral trials is 3 s.

a) Determine a quadratic function that models the falling stones.

b) How high above the water are Bill and Ben? Explain your answer.

c) On Saturn's moon, Titan, the value of g is 1.35 m/s^{2. } Suppose that Bill and Ben are astronauts and they are standing at the top of a cliff on Titan. If they record the time for a stone to fall from their hands to the bottom of the cliff as 3 s, how high is the cliff, to the nearest hundreth of a metre?

Posted 3 years ago by **mlodberg** in Math 20-2 | 3 answers

#quadratic functions

-2.09595 x (T2-95.6) degrees celcius=104.5 x (T2-25) degrees celcius

I am trying to solve for T2

Posted 3 years ago by **dbrar** in Chemistry 30 | 2 answers

#net enthalpy

Calculate the standard enthalpy change for the net reaction from the following chemical equations and standard enthalpy changes.

A) 2C+O2-->2CO. =-221.0KJ

B) C+O2-->2CO2. = -393.5KJ

C) 2H2+O2-->2H2O. =-483.6KJ

NET: CO+H2+O2-->CO2+H2O =?

Posted 3 years ago by in Chemistry 30 | 1 answers

#net enthalpy