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4 years ago

Dermatitis is a common result of

1 answer:

3 0

I think the answer is
a.touching chemical solvent
Dermatitis is a general term that describes an inflammation of the skin. Dermatitis can have many causes and occurs in many forms. It usually involves an itchy rash on swollen, reddened skin.
Skin affected by dermatitis may blister, ooze, develop a crust or flake off. Examples of dermatitis include atopic dermatitis (eczema), dandruff and rashes caused by contact with any of a number of substances, such as poison ivy, soaps and jewelry with nickel in it.

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A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water

ivolga24 [154]

Power<span> is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. We express it as follows:

P = W / t
where W = Fd
F = mg

Therefore,

P = mgd / t
P = (30)(9.81)(20) / 1 = 5886 W</span>

3 0

3 years ago

Write one general properties of non contact force

Gekata [30.6K]

Answer: Gravitational force between the two masses does not depend on the medium separating two masses.

3 0

3 years ago

The Earth's diameter at the poles is _____.

maria [59]

Less than it’s diameter at the equator

4 0

3 years ago

Read 2 more answers

I'M GIVING 95POINTS PLZ HELP!!

Travka [436]

initial height = 25000 ft

as we know that

1 ft = 0.3048 m

so we have

H = 25000(0.3048) = 7620 m

If mass of the man = 90 kg

now the initial potential energy is given as

$U = mgh$

$U = (90)(9.8)(7620)$

$U = 6.72 \times 10^6 J$

Gravitational force that is acting on it is given by

$F = mg$

$F = 90(9.8) = 882 N$

so this is the force by which earth is attracting him towards it as we can see due to this force the man is accelerating towards the earth

As we know that gravitational force is given by

$F = \frac{GMm}{r^2}$

here we know that

r = R + h

R = radius of earth ( $6.37 \times 10^6 m$ )

h = 7620 m

now we have acceleration at that point is

$a = \frac{F}{m}$

$a = \frac{GM}{r^2}$

$a = \frac{(6.67\times 10^{-11})(5.98 \times 10^{24})}{(6.37 \times 10^6 + 7620)^}$

$a = 9.806 m/s^2$

by energy conservation we have

$KE = PE$

$\frac{1}{2}mv^2 = mgh$

$v^2 = 2gh$

$v^2 = 2(9.8)(7620)$

$v = 386.5 m/s$

final speed due to wind resistance is 150 mph

now we know that

1 mile = 1609 meter

so this speed in m/s is given as

$150 mph = 150(\frac{1609 m}{3600 s})$

$v = 67 m/s$

No Luke is not accelerating when his speed is 150 mph

because at this speed his velocity will become constant

and since there is no change in velocity so his acceleration will become zero

since at 150 mph the acceleration of Luke is zero

so net force on him must be zero

so we will have

wind force = weight or force due to earth

$F_{wind} = 882 N$

If there is no wind resistance then there will be energy conservation

so KE = PE

$KE = 6.72 \times 10^6 J$

#10

Net will reduce the velocity of luke to be zero by taking long time

As we know that force on a system is given by

$F = \frac{\Delta P}{\Delta t}$

so if we increase the time interval here then we will have less force

so Luke will unhurt due to more time to decrease his speed to be zero

5 0

3 years ago

What is potential energy

Ronch [10]

Answer:

Potential Energy is when the energy is kept in place the object isnt moving so it isnt creating Kinetic energy.

3 0

4 years ago

Read 2 more answers