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3 years ago

Which of the following statement is not true about machines?

Physics

2 answers:

viva [34]3 years ago

4 0

The answer to this question is D or the last one

tester [92]3 years ago

4 0

The machine can affect the productivity in various ways.

The work done by a substance is is product of force and displacement.

Mathematically Work done W = FS where F is the force and S is the distance travelled.

The most significantly machine changes the direction of force which is required to carry out the required work.By doing so, the machines can lessen or increase the force needed for the work.We may say that the machines change the size of the force.

A machine can affect the work done by changing the way in which the work is done.The vice versa is not true.The machine can not decrease the amount of work that is done

Hence the correct option will be the last one i.e machines decrease the amount of work that is done.

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A student solving for the acceleration of an object has applied appropriate physics principles and obtained the expression a=a1

AlekseyPX

Explanation:

A student solving for the acceleration of an object has applied appropriate physics principles and obtained the expression :

$a=a_1+\dfrac{F}{m}$

Where

$a_1=3\ m/s^2$

$F=12\ kg-m/s^2$

m = 7 kg

So, the correct step for obtaining a common denominator for the two fractions in the expression in solving for a is (a) and the value of a is :

$a=3+\dfrac{12}{7}$

$a=4.71\ m/s^2$

Hence, the correct option is (a).

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2 years ago

Kyle has the mass of 54 kg and is jogging at a velocity of m/s. What is Kyle’s kinetic energy

inysia [295]

m = mass = 54 kg

v = velocity = 3 m/s

KE = (1/2)*m*v^2

KE = (1/2) * 54 * (3)^2

KE = 243 J

Hope this helps!

3 0

2 years ago

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It is important to use the correct drying tempture because it prevents shrinkage and will not damage the garment.

Nina [5.8K]

Answer:

fjowe

Explanation:

kbegtrf3g4ef j3kq4ef 3w4beysrf2w4er8f6ywgbaebf7v2wy4egdwa4i6e5

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3 years ago

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5. What is the mass (m) of an object with a speed (v) of 10 m/s and a momentum

ZanzabumX [31]

Answer:

0.54kg

Explanation:

p=mv

m=p/v

m=5.4/10

=0.54kg

4 0

3 years ago

An object is made up of three masses connected by massless rods of fixed length. Mass A is located at (30.0 cm, 0 cm) and has a

puteri [66]

Answer:

0.0605 Kg m^2

Explanation:

In this case where we have find he moment of inertia of this object about an axis perpendicular to the x-y plane and passing through the origin, we can just add three moment of inertia's .

MOI= 0.25×0.3^2 + 0.35×0.4^2- 0.45×0.2^2

= 0.0605 Kg m^2

8 0

3 years ago