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3 years ago

TRUE or FALSE: Feeling "weightless" can be the result of accelerating downwards towards Earth.

1 answer:

4 0

I believe it would be false because in outer space, everything is weightless due to the weak gravitational force which makes things float in the air. Weightless means no weight to it and if we’re accelerating down that means the gravitational is working but in this case it would probably be false

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A helicopter is moving horizontally to the right at a

In-s [12.5K]

Answer:

Explanation:

Given

Weight of helicopter $W=53800 N$

inclination of blades with vertical $\theta =21^{\circ}$

Suppose $F_l$ is the lifting Force

Now using F-B-D

$F_{net}=0$ as helicopter is moving with constant velocity

balancing forces in Vertical Force

$F_l\cos \theta -W=0$

$F_l\cos \theta =W$

$F_l=\frac{W}{\cos \theta }$

$F_l=\frac{53800}{\cos 21}$

$F_l=57,627.6\ N$

Now sin component of lift is air resistance

$F_l\sin \theta -R=0$

where R=air resistance

$R=F_l\sin \theta$

$R=57,627.6\times \sin (21)$

$R=20,651.88\ N$

8 0

4 years ago

If the space station is 190 m in diameter, what angular velocity would produce an "artificial gravity" of 9.80 m/s2 at the rim?

ozzi

Answer:

The angular velocity produced is 0.321 rad/s.

Explanation:

Given :

Diameter of space station , D = 190 m.

Therefore, radius , $R=\dfrac{D}{2}=\dfrac{190}{2}=95\ m.$

Also, acceleration , $a=9.8\ m/s^2.$

We know, angular velocity , $\omega=\sqrt \dfrac{a}{R}$ .

Putting value of g and R in above equation.

We get ,

$\omega=\sqrt \dfrac{9.8\ m/s^2}{95\ m}$

$\omega=0.321\ rad/s.$

Hence, this is the required solution.

6 0

4 years ago

A car left Point A at 7:30 am and arrived at Point B, 162 miles away at 10:30 am. What was its average speed in miles per hour?

andre [41]

The formula for average speed is,

S= Total Distance Covered / Total Time Taken

In the given problem,

The total distance covered is 162 miles.
Since only the times are given, we have to determine how many hours did the car traveled from 7:30am to 10:30am.

To get the number of hours: First, subtract the hours, then the minutes. Hours: 10-7=3
Minutes: 30-30=0

Therefore,

S = 162miles/3hrs
S = 54miles/hr

The average speed of the car is 54miles/hr.

8 0

3 years ago

The ball is displaced to the left and then oscillates backwards and forwards between the two plates. The ball touches a plate on

ELEN [110]

Answer:

Average current produced by the repeated transfer of charge is 5.6 × 10⁻⁷ ampere

Explanation:

The formula to be used here is

Q = It

where Q is the quantity of electricity and it is measured coulombs (C); 2.8 × 10⁻⁸ C or 0.000000028 C

I is current and it is measured in ampere (amps or A); unknown

t is time and it is measured in seconds (s); 0.05 s

Since, average current is what is unknown

I =Q/t

I = 0.000000028/0.05

I = 5.6 × 10⁻⁷ A

Average current produced by the repeated transfer of charge is 5.6 × 10⁻⁷ ampere

4 0

3 years ago

What electrons are in “motion”, what do you have?

Sergeeva-Olga [200]

Answer:

When a positive charged object is placed near a conductor electrons are attracted the the object. ... When electric voltage is applied, an electric field within the metal triggers the movement of the electrons, making them shift from one end to another end of the conductor. Electrons will move toward the positive side. As you know, electrons are always moving. They spin very quickly around the nucleus of an atom. As the electrons zip around, they can move in any direction, as long as they stay in their shell.

7 0

4 years ago