3 years ago

How does temperature affect chemical reaction rates?

Physics

2 answers:

Bad White [126]3 years ago

5 0

A. low temperature starts a reaction

Liula [17]3 years ago

5 0

The answer is D higher temperature provides more genetic energy to the particles.

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A meter movement has a series resistance of 1Ω and a full scale current of 1mA. Use this meter movement to design a 10V full sca

Julli [10]

Answer:

10V = 1mA(1Ω + Rs)

Rs=10-1

Rs=9Ω

Explanation:

See the attached picture for diagram.

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4 years ago

A ball of mass 45kg thrown upward with a velocity of 40m/s

AnnyKZ [126]

1) KE=1/2*m*v^2
1/2*45*40^2
KE=36,000J

2) PE=mgh
45*9.81*30
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3 years ago

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Paraphin [41]

Answer:

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3 years ago

A train 471 m long is moving on a straight track with a speed of 75.1 km/h. The engineer applies the brakes at a crossing, and l

hram777 [196]

Answer:

$t = 37.6 s$

Explanation:

As we know that train is initially moving with the speed

$v_i = 75.1 km/h$

now we know that

$v_i = 20.86 m/s$

now the final speed of the train when it crossed the crossing

$v_f = 15 km/h$

$v_f = 4.17 m/s$

now we can use kinematics here

$v_f^2 - v_i^2 = 2 a d$

$4.17^2 - 20.86^2 = 2 a(471)$

$a = -0.44 m/s^2$

Now the time to cross that junction is given as

$v_f - v_i = at$

$4.17 - 20.86 = a(-0.44)$

$t = 37.6 s$

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3 years ago

An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground?

Scorpion4ik [409]

Answer:

80 ft/s

Explanation:

Use III equation of motion

V^2 = U^2 + 2g h

Here, U = 0, g = 32 ft/s^2, h = 100 ft

V^2 = 0 + 2 × 32 ×100

V^2 = 6400

V = 80 ft/s

8 0

3 years ago