The balanced half-reaction in which dichromate ion is reduced to chromium metal is a ________ process. a. two-electron b. six-electron c. four-electron d. three-electron e. twelve-electron

Answers

Answer 1

Answer:

Answer:

The balanced half-reaction in which dichromate ion is reduced to chromium metal is a six-electron process.

Explanation:

The dichromate ion (Cr2O72-) has an oxidation state of +6, while chromium metal has an oxidation state of 0. So, 6 electrons must be transferred from the dichromate ion to chromium metal for the reduction to occur.

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A charge of 90 C passes through a wire in 1 hour 15 minutes . what is the current in the wire

Answers

We calculate current from the formula:
$I= (q)/(t)$ , where q is a electric charge transferred over time t
Time should be converted to seconds:
1h 15 min= 75min= 4500s
I= $(90C)/(4500s)=0,02A$ Result is in unit-Ampere

Current = C / seconds.

1 hour = 3600 seconds
15 minutes = 900 seconds

1 hour 15 minutes = 4500 seconds

90 C / 4500 sec = 0.02 amperes = 20 milliamperes

After generating a hypothesis, a scientist next: A. designs a series of tests. B. formulates a theory. C. makes a prediction. D. writes a grant proposal. E. does an experiment.

Answers

The answer is (c) because

a sphere rolls down without slip on an inclined plane of inclination theta. what is the linear acceleration as the sphere reaches the bottom

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Answer:When a sphere rolls down an inclined plane without slipping, its linear acceleration at the bottom can be calculated using the following formula:

a = g * sin(theta)

where "a" is the linear acceleration, "g" is the acceleration due to gravity (approximately 9.8 m/s^2), and "theta" is the angle of inclination of the plane.

Let's break down the formula step by step:

1. First, we need to determine the component of the gravitational force that acts parallel to the inclined plane. This component is given by g * sin(theta), where "g" is the acceleration due to gravity and "theta" is the angle of inclination.

2. Since the sphere is rolling without slipping, the frictional force between the sphere and the inclined plane is responsible for its linear acceleration. This frictional force is equal to the component of the gravitational force parallel to the plane.

3. Therefore, the linear acceleration of the sphere as it reaches the bottom of the inclined plane is equal to the component of the gravitational force parallel to the plane, which is g * sin(theta).

For example, if the angle of inclination, theta, is 30 degrees, the linear acceleration of the sphere at the bottom of the inclined plane would be:

a = g * sin(30) = 9.8 m/s^2 * 0.5 = 4.9 m/s^2

So, the linear acceleration of the sphere as it reaches the bottom of the inclined plane would be 4.9 m/s^2 when the angle of inclination is 30 degrees.

Explanation:

A racecar is traveling in uniform circular motion around a racetrack. What happens to the centripetal acceleration of the car if the speed is doubled and the radius of the circle remains constant?

Answers

Answer:

centripetal acceleration becomes 4 times

Explanation:

Given that a car is in the uniform circular motion on a circular track initially and then its speed is doubled.

Now as we know the equation for centripetal acceleration in a circular motion is given as:

$a_c=(v^2)/(r)$

where:

$a_c=$ initial centipetal acceleration

v = initial speed of the car

r = radius of the track (remains constant)

When the speed is doubled:

$a_c'=((2v)^2)/(r)$

$a_c'=(4v^2)/(r)$

$a_c'=4* (v^2)/(r)$

$a_c'=4\ a_c$

i.e. centripetal acceleration becomes 4 times in the later case.

Answer:

4 TIMES

Explanation:

As centripetal acceleration has formula a =v^2/r. as r is constant so a is directly proportional to square of speed so square of 2 is 4 hence 4 times

The closer together a magnets field lines are,

Answers

the stronger they will be

The metric unit of force is _____. kg kg/cm3 kg/cm2 N

Answers

The metric unit of force is Newton or N. The Newton unit is also equal to kilogram per meter per second squared. The Newton name came from the late physicist Isaac Newton. It is also based on the second law of motion.

Answer:

the metric unit of force is N for newton.

Explanation:

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A screenshot of the question is attached. Gravity=10N/Kg

A bicyclist bikes the 56 mi to a city averaging a certain speed. The return trip is made at a speed that is 6 mph slower. Total time for the round trip is 11 hr. Find the bicyclist's average speed on each part of the trip.

Sherlock Holmes discovers some hair fiber at a crime scene. He view the hairs through his magnifying glass from a distance of 6 cm. If the hairs are magnified 4.0 times, what is the distance to the magnified image?

Tyler drives 50km north. Tyler then drives back 30km south. What distance did he cover? What was his displacement?