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4 years ago

The first simple, one-celled organisms that developed during the Precambrian era are called

Physics

1 answer:

vovikov84 [41]4 years ago

7 0

Bacteria and or archaea.

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Which of these most likely represents a chemical change? water boiling sugars digested by saliva mud drying to dirt ice cream me

mote1985 [20]

I think the correct answer would be sugars digested by saliva. This describes a chemical change since new substances are produced since reaction happens due to the enzymes in the saliva. Hope this answers the question. Have a nice day.

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3 years ago

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The mechanical advantage of a simple machine is 3 and its velocity ratio is 4 find its efficiency

LiRa [457]

Answer:

75%

Explanation:

Efficiency=MA/VR*100

=3/4*100

=0.75*100

=75%

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2 years ago

A pottery wheel, initially at rest, is assumed to be a uniform disk of mass 3.0 kg and radius 20.0 cm. A 25.0 N force is applied

miv72 [106K]

Answer:

a) 83.33 rad/s^2

b) 2500 rad/s

c) 6187.5 rad

Explanation:

Given data:

radius of wheel = 20.0 cm

mass of wheel = 3.0 kg

force = 25 N

a) angular acceleration

we know torque is given as

$T = I \times \alpha$

$F\times R = I \times \alpha$

$F\times R = \frac{1}{2} mR^2 \times \alpha$

solving for angular acceleration $\alpha$

$\alpha = \frac{2F}{mR} = \frac{2*25}{3*0.2} = 83.33 rad/s^2$

b) angular velocity

duartion of force applied = 30.0 sec

$\omega_{30} = \omega_0 +alpha t$

= o + 83.33 *30 = 2500 rad/sec

c) angular displacement

$\theta_{15} = = \omega_0 +\frac{1}{2} alpha t_{15}^2 = 0 + \frac{1}{2} 83.33 \times 15^2$

$\theta_{30} = \omega_0 +\frac{1}{2} alpha t_{30}^2 = 0 + \frac{1}{2} 83.33 \times 30^2$

$\Delta \theta = \theta_{30} - \theta_{15}$

$\Delta \theta = 6187.5 rad$

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3 years ago

The type of change that occurs when a solid becomes a liquid is_______.

GenaCL600 [577]

That would be melting. From a liquid to a gas is evaporation, and from a solid directly to a gas is sublimation. From a gas to a liquid is condensation, and from a liquid to a solid is freezing.

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3 years ago

What is frost weddging

kiruha [24]

Freeze wedging is caused by the repeated freeze-thaw. Frost wedging occurs as the result of 9 % expansion of water when it is converted to ice. Cracks filled with water are forced further apart when it freezes. cycle.

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3 years ago

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