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3 years ago

The average speed of a snail is 0.020 miles/hour and that of a Leopard is 70 miles/hour. Convert these speeds in SI units.

1 answer:

8 0

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The angle between an incident ray and the mirror is 40°. 1) What is the angle of reflection?

Vlad1618 [11]

Answer:

1) 50°

Explanation:

We need to find the angle of incidence first before finding the angle of reflection.

Angle of incidence = 90° - 40°

= 50°

Since the angle of incidence is the same as the angle of reflection, the angle of reflection here would be 50°.

5 0

2 years ago

F the voltage in a circuit is 80 volts and the resistance is 20 ohms, what is the current?

jek_recluse [69]

I = 4 A

Explanation:

From Ohm's law, the voltage is given by

V = IR

I = V/R = (80 V)/(20 ohms)

= 4 A

4 0

2 years ago

A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 2.1 m. The maximum angle the str

just olya [345]

Answer:

The speed of the object at the lowest point in its trajectory is:

$v=2.34\: m/s$

Explanation:

We can use the conservation of energy between the maximum point of swing and the lowest point of the pendulum.

$P=K$

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

Where:

h is the height of the object at 30° with the vertical.
v is the speed at the lowest point.

We can find h using trigonometry.

$h=L-Lcos(30)=L(1-cos(30))$

$h=2.1(1-cos(30))=0.28\: m$

Now, using equation (1) we can find v.

$gh=\frac{1}{2}v^{2}$

$2gh=v^{2}$

$v=\sqrt{2gh}$

$v=\sqrt{2(9.81)(0.28)}$

$v=2.34\: m/s$

I hope it helps you!

8 0

2 years ago

Because the Earth rotates about its axis, a point on the equator experiences a centripetal acceleration of 0.033 7 m/s2, while a

xxTIMURxx [149]

Answers:

a) $F_{g}=735 N$ and $n=732.47 N$ , hence $F_{g} > n$

b) $n_{poles}=735 N$ $n_{equator}=732.47 N$

Explanation:

a) At the equator, both the centripetal force $F_{c}$ and the gravitational force $F_{g}$ (also called true weight) are directed "downward", while the normal force $n_{equator}$ (also called apparent weight) is directed "upward". Therefore we have the following equation: