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jek_recluse [69]

2 years ago

12

Suppose that you are taking a course in geometry. You are trying to determine whether two geometric shapes are identical, so you

mentally rotate one of the figures in a clockwise fashion. You are likely to find that:

1 answer:

Nataly_w [17]2 years ago

3 0

Explanation:

Yes, in order to determine whether two geometric figures are identical or not we tend to rotate one of the figure clockwise or anti clock wise mentally. However, in clockwise rotation larger the angel more will be the time taken for instance, it will take longer to rotate 120° than to rotate 40°. Whereas in anti clockwise ration it will be vice versa.

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dybincka [34]

Answer:

1. 218.55 N

2. $30.96^{o}$

3. $2.1 m/s^{2}$

Explanation:

Part 1;

Net force $F=mg sin \theta$ where m is mass, g is gravitational force and $\theta$ is the angle of inclination

$F= 46*9.8*sin 29^{o}= 218.55N$

Frictional force, $F_{r}$ is given by

$F_{r} = \mu_{s}mg cos \theta$ where $\mu_{s}$ is the coefficient of static friction

$F_{r} = 0.6*46*9.8 cos 29$

$F_{r}=236.57N$

Since $F_{r}>F$ , therefore, the block doesn’t slip and the frictional force acting is mgh=218.55N

Part 2.

Using the relationship that

Frictional force $F_{s} = \mu_{s} mg cos \theta$

$mg sin \theta =\mu_{s} mg cos \theta$

$\mu_{s}= \frac {sin \theta}{cos \theta}$

$\mu_{s}= tan \theta$

The maximum angle of inclination $\theta = tan^{-1} \mu_{s}$

$\theta = tan^{-1} (0.6)$

$\theta= 30.96^{o}$

Part 3:

Net force on the object is given by

$ma = mg sin 38 - \mu_{k} mg cos 38$ where $\mu_{k}$ is the coefficient of kinetic friction

$a = g ( sin 38 - \mu_{k} cos 38 )$

= 9.8 ( sin 38 - (0.51) cos 38 )

= $2.1m/s^{2}$

7 0

3 years ago

Select the correct answer,

Tresset [83]

Answer:

I'm pretty sure it's air pressure.

Explanation:

4 0

2 years ago

With what magnitude of force does a ball of mass 0.75 kilograms need to be hit so that it accelerates at the rate of 25 meters/s

SSSSS [86.1K]

Answer:

Assume that the ball undergoes motion along a straight line. ... F = m A Force = (mass) x (acceleration) The question tells you the mass and the acceleration. All YOU have to do is take the numbers and pluggum into Newton's 2nd law. F = m A = (0.75 kg) (25 m/s²) = (0.75 x 25) kg-m/s² = 18.75 Newtons .

Explanation:

i looked it up ok

8 0

2 years ago

Read 2 more answers

What is the kinetic energy of the 80kg skydiver if he is moving at 60m/s? (Show the equation, show your work and answer with uni

s344n2d4d5 [400]

Answer:

The answer to your question is: Ke = 144000 Joules

Explanation:

Data

Kinetic energy = ?

mass = 80 kg

speed = 60 m/s

Equation

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

$Ke = \frac{1}{2} (80)(60)^{2}$

Ke = 144000 Joules

4 0

2 years ago

If you could fit 2.5 equal potatoes across the pan in one direction and 5 of the same potatoes in the other direction,how big ar

Ulleksa [173]

The length of the potatoes is (0.4) x (the length of the pan).

The width of the potatoes is (0.2) x (the width of the pan).

5 0

3 years ago