Recent questions tagged ch4

A stone is thrown horizontally outward from the top of a bridge.The stone is released 19.6m above the street below.The initial velocity of the stone is 5.0m/s.Determine the magnitude and direction of the velocity of the projectile "just" before it strikes the street.

asked Aug 13, 2014 by sreemathi.v

1 answer

A projectile is fired with an initial speed of 113m/s at an angle of $60.0^{\large\circ}$ above the horizontal from the top of a cliff 49.0m high.Determine the total time it stays in the air,and horizontal range of the projectile.

asked Aug 13, 2014 by sreemathi.v

1 answer

A projectile is fired with an initial speed of 113m/s at an angle of $60.0^{\large\circ}$ above the horizontal from the top of a cliff 49.0m high.Determine the tome to reach maximum height,maximum height above the base of the cliff reached by the projectile.

asked Aug 13, 2014 by sreemathi.v

1 answer

Five balls A,B,C,D and E are projected with the same speed making angles of $10^{\large\circ},30^{\large\circ},45^{\large\circ},60^{\large\circ},80^{\large\circ}$ respectively,with the horizontal.Which ball will strike the ground at the farthest point?

asked Aug 13, 2014 by sreemathi.v

1 answer

A spring gun placed on a table fires a steal ball at a $45^{\large\circ}$ angle above the horizontal.The ball leaves the muzzle of the gun 1.1m above the floor and travels 4.6m horizontally.Determine the total time that the ball is in the air.

asked Aug 13, 2014 by sreemathi.v

1 answer

In a particular laboratory experiment,a spring gun placed on a table fires a steal ball horizontally outward.A student determines that the ball starts 1.0m above the floor and travels 2.7m horizontally before it strikes the floor.Determine the time that the ball is in the air and initial velocity of the ball

asked Aug 13, 2014 by sreemathi.v

1 answer

You start from a point and your first move is 5 m at an angle of 53.1$^{\circ}$. Your second move was 6 m along the x-axis and some unknown distance along the y-axis. Your third move was some unknown distance along the x-axis and -3 m along the y-axis. If you ended up at a point 5.39 m from where you started and 21.8$^{\circ}$ below the x-axis, calculate the unknown components of your second ($y_2$) and third ($x_3$) moves .

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A jet plane takes off with a velocity of 300 km/s at a bearing of 60$^{\circ}$. A wind with a velocity of 80 km/s NW blows it off course. What is the resultant velocity of the jet plane (magnitude and the bearing)?

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A hiker begins a trip by first walking 25 km southeast from her car. She stops and sets up her tent for the night. On the second day, she walks 40 km in a direction 60$^{\circ}$ north of east, at which point she discovers a forest ranger’s tower. Write the total displacement in unit vector form.

asked Aug 11, 2014 by balaji.thirumalai

1 answer

A car travels 20 km due north and then 35 km in a direction 60$^{\circ}$ west of north as shown below. Find the magnitude and direction of the car’s resultant displacement.

asked Aug 11, 2014 by balaji.thirumalai

1 answer

For the reaction $A+B \rightarrow C+D$, calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The activation energy for a certain reaction is 76.7 kJ mol$^{-1}$. How many times faster will the reaction occur at 50$^\circ$C compared to 0$^\circ$C?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant of a reaction at 32$^\circ$C is 0.055 s$^{-1}$. If the frequency or pre-exponential factor is 1.2 $\times$ 10$^{13}$ s$^{-1}$, what is the activation energy?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

If a temperature increase from 20$^\circ$C to 35$^\circ$C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant (k) for a reaction was determined as a function of temperature. A plot of $ln\; k$ versus $ \large\frac{1}{T}$ (in $K$) is linear and has a slope of $-1.01 \times 10^{4}\;K$. Calculate the activation energy for the reaction.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain reaction is first order, and 540 s after initiation of the reaction, 32.5% of the reactant remains. At what time after initiation of the reaction of the reaction will 10% of the reactant remain?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain first order reaction is 45% complete in 65 seconds. Determine the rate constant and the half-life for this process.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate half-life for first-order reaction if 68% of a substance is reacted within 66 s.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

What is the rate of a reaction if $[A]_o = 560\;M$, $[B]_o = 0.2\;M$, and 2nd order rate constant is $0.1\;M^{-1}s^{-1}$?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

What is the concentration of $A$ at time $45\;s$ if $[A]_o = 1\;M$, $[B]_o = 45\;M$, and 2nd order rate constant is $0.6\;M^{-1}s^{-1}$?

asked Jul 25, 2014 by balaji.thirumalai

1 answer