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Sveta_85 [38]
3 years ago
11

What is the pressure of a 300 lb. object on a 100 sq. in. area?

Physics
1 answer:
denis23 [38]3 years ago
3 0

Answer:

D. 3 psi

Explanation:

Pressure is defined as force acting per unit area and is numerically expressed as:

P= \frac {F}{A}

where P represent pressure, F is force and A is area where the force acts. Substituting 300 lb for force and 100 sq.in for area then pressure,

P=\frac {300 lb}{100 in^{2}}= 3 \ psi

Therefore, from the choices given, option D, 3psi is the right choice.

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Answer:

Explanation:

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initial kinetic energy = 1/2 m v²

= .5 x m x 12 x 12

= 72 m

This energy will be spent to store potential energy . if h be the height attained

potential energy = mgh , h is vertical height attined by block

= mg l sin20  where l is length up the inclined plane  

for conservation of mechanical energy

initial kinetic energy  = potential energy

72 m = mg l sin20

l = 72 /  g  sin20

= 21.5 m

deceleration on inclined plane = g sin20

= 3.35 m /s²

v = u - at

t = v - u / a

= (12 - 0) / 3.35

= 3.58 s

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= 7.16 s

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3 years ago
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2 years ago
Correct Number Formats Numbers may be entered in several formats - including scientific notation and numerical expressions.
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Answer:

a. Valid

b. Invalid

c. Invalid

d. Invalid

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g. Invalid

Explanation:

a.

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Therefore, this number is <u>Valid</u>

b.

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Therefore, it is <u>Invalid</u>

c.

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d.

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Therefore, it is <u>Invalid</u>

e.

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Therefore, this number is <u>Valid</u>

f.

Since, it follows all the four rules,

Therefore, this number is <u>Valid</u>

g.

It violates third rule for including unit.

Therefore, it is <u>Invalid</u>

6 0
3 years ago
A homing pigeon starts from rest and accelerates uniformly at +4.00 m/s squared for 10.0 seconds. What is its velocity after the
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'  +4 m/s² ' means that the pigeon's speed is  4 m/s greater every second.

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We can't say anything about its velocity, because we have
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5 0
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In a nuclear power plant, _____. energy is released from the nuclei of atoms energy is released from the bonds of molecules ener
oksian1 [2.3K]
In a nuclear power plant, energy is released from the nuclei of atoms. The correct option among all the options given in the question is the first option. Huge amount of thermal energy is released by the breaking of the uranium atoms. This energy is used for turning a turbine that produces electricity. It is a very clean method of producing electricity. 
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3 years ago
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