PHYSICS HIGH SCHOOL

If the activation energy for a given compound is found to be 103 kJ/mol, with a frequency factor of 4.0 × 1013 s-1, what is the rate constant for this reaction at 398 K?

Answers

Answer 1

Answer:

Answer: The Rate constant is 1.209

Explanation:

in the attachment

Answer 2

Answer:

Explanation:

Below is an attachment containing the solution.

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Scientists believe Earth is about how many billion years old

Answers

The earth is 4.54 billion years old.

At what speed must a 950-kg subcompact car be moving to have the same kinetic energy as a 3.2×104−kg truck going 20 km/h?

Answers

Answer:

950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Explanation:

Kinetic energy of body with mass m and moving at velocity v is given by

$KE=(1)/(2) mv^2$

KE of truck $= (1)/(2)*3.2*10^4*20^2$

KE of subcompact car $= (1)/(2)*950*v^2$

Equating

$(1)/(2)*3.2*10^4*20^2= (1)/(2)*950*v^2\n \n v=116.08 km/hr$

So 950-kg subcompact car be moving to have the same kinetic energy of truck at 116.08 km/hr

Final answer:

To have the same amount of kinetic energy as a 3.2x10^4kg truck moving at 20km/h, a 950-kg subcompact car would need to be moving at an approximate speed of 224 m/s.

Explanation:

The problem requires us to calculate the speed that a 950-kg car must achieve to have the same kinetic energy as a 3.2×104-kg truck moving at 20 km/h. The kinetic energy of an object is represented by the equation K = 0.5mv² where m signifies mass and v speed.

The truck's kinetic energy can be calculated using this formula: Ktruck=0.5(3.2×104kg)(20 km/hr * 1000 m/km / 3600 s/hr)² = 1.96 x 107 J.

For the car to have the same kinetic energy, we set up the following equation and solve for v: 1.96 x 107 J = 0.5(950 kg)v², yielded v = 224 m/s.

Thus, the subcompact car needs to move at a speed of 224 m/s to have the identical kinetic energy as the truck moving at 20 km/h.

Learn more about kinetic energy here:

brainly.com/question/26472013

#SPJ3

A 25 N object is 3 meters up. How much potential energy does it have.

Answers

We have: Potential Energy, U = m×g×h
U = F×h
Here, F = 25 N
h = 3 m

Substitute their values into the expression,
U = 25 × 3
U = 75 Nm
U = 75 J

So, You Final answer would be 75 Joules.

Hope this helps!

Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate. She also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. She finishes her description by saying that the steam can be turned back into water if it is cooled.what was her mistake?

Answers

Answer:

atoms remain bonded to each other in physical changes.

Explanation:

Answer:

Explanation:

Please help me with this practice question

Answers

the answer is c hopes this helps

What is the minimum speed with which he’d need to run off the edge of the cliff to make it safely to the far side of the river? the answer was 6 m/s the world-record time for the 100 m dash is approximately 10 s. given this, is it reasonable to expect brady to be able to run fast enough to achieve brady's leap? a.yes, the obtained speed is less than the world-record.
b.yes, the obtained speed is almost equal to the world-record.
c.no, the obtained speed is greater than the world-record.
d.no, the obtained speed is almost equal to the world-record.

Answers

The answer is

A. Yes, the obtained speed is less than the world record

The explanation:

when the obtained speed is 6 m /s

and the world record speed = distance / time = 100 m / 10 s = 10 m/s

So, Yes, the obtained speed is less than the world record

Not only is it less, its also a reasonable average speed for a somewhat athletic person. Therefore, the leap is entirely possible.

-Samuel Brady gained his lasting notoriety for his leap over the Cuyahoga River around 1780 in what is now Kent, Ohio. After following a band of Indians into the Ohio country, a failed ambush attempt resulted in the band chasing Brady near the Cuyahoga River. To avoid capture, Brady leaped across a 22-foot (6.7 m) wide gorge of the river (which was widened considerably in the 1830s for construction of the Pennsylvania and Ohio Canal) and fled to a nearby lake where he hid in the water under a fallen tree using a reed for air.

Part (a): The minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

Part (b): The speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Further Explanation:

(a)

Brady jumps from a cliff to go on other side. He crosses $22\text{ ft}$ horizontal distance from a height of $20\text{ft}$ . To jump from cliff, he follows the Newton’s law of motion.

Given:

The horizontal distance is $22\text{ ft}$ .

The vertical distance is $20\text{ft}$ .

Concept:

The horizontal distance in meter is $6.71\text{ m}$ .

The vertical distance in meter is $6.10\text{ m}$ .

To obtain the time of flight, applying one of the equation of motion given as:

$s=ut+(1)/(2)at^2$

Substitute $0\text {m/s}$ for $u$ and rearrange the above equation for $t$ :

$t=\sqrt{(2s)/(a) }$

Substitute $6.10\text{ m}$ for $s$ and $9.81\text{ m}/\text{s}^2$ for $a$ in above equation.

$\begin{aligned}t&=\sqrt{(2*6.10)/(9.81)}\text{ s}\n&=1.12\text{ s}\end{aligned}$

The time of flight and time taken to cover horizontal distance are equal.

Horizontal velocity of Brady given as:

$\begin{aligned}v&=(6.71)/(1.12)\text{ m/s}\n&\approx6\text{ m/s}\end{aligned}$

Thus, the minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

(b)

The minimum speed with which Brady is running is $6\text{ m/s}$ .

The speed of world record given as:

$\begin{aligned}V&=(100)/(10)\text{ m/s}\n&=10\text{ m/s}\end{aligned}$

Thus, the speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Learn more:

1. Projectile motion of a body: brainly.com/question/11023695

2. Body in pure rolling motion: brainly.com/question/9575487

3. Newton’s law of motion: brainly.com/question/6125929

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

1780, Brady's Leap, Captain, Sam, U.S. Continental Army, horizontally, cliff, Ohio's Cuyahoga, gorge, leap, 22 ft, 20 ft, minimum, speed, river, 100 m, dash, 10 s, jump, time of flight, vertical and distance.

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