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3 years ago

Explain why 5N + 4N does not always mean a resultant force of 9N

Physics

1 answer:

Lady_Fox [76]3 years ago

7 0

Answer:

Since Force is a vector quantity, It depends on both magnitude and direction.

So, the resultant depends also on the direction.

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How does an electric iron work when the power is on

snow_lady [41]

Answer:

The basic principle on which the electric iron works is that when a current is passed through a piece of wire, the wire heats up. This heat is distributed to the sole (base) plate of the electric iron through conduction.

5 0

4 years ago

A projectile is fired with a velocity of 22 m/s at an angle of 25°. What is the vertical component of the velocity?

7nadin3 [17]

Answer:

Vertical component of velocity is 9.29 m/s

Explanation:

Given that,

Velocity of projection of a projectile, v = 22 m/s

It is fired at an angle of 22°

The horizontal component of velocity is v cosθ

The vertical component of velocity is v sinθ

So, vertical component is given by :

$v_y=v\ sin(25)$

$v_y=22\ m/s\times\ sin(25)$

$v_y=9.29\ m/s$

Hence, the vertical component of the velocity is 9.29 m/s

3 0

4 years ago

A force of 150 N is continuously applied to an object with a mass of 11 kg over a distance of 2.5 m.The object slides over a sur

Ivahew [28]

Answer:

Final velocity will be 7.31 m/sec

Explanation:

We have given applied force F = 150 N

Mass of the object m = 11 KG

Distance traveled by the object s = 2.5 m

Coefficient of kinetic friction $\mu _k=0.3$

Acceleration due to gravity $g=9.8m/sec^2$

So frictional force applied on the object $f=-\mu _kmg=-0.3\times 11\times 9.8=-32.34N$

So net force = 150-32.34 = 117.66 N

As work done us equal to $W=Fs$

So work done = $117.66\times 2.5=294.15j$

Now according to work energy theorem work done is equal to change in kinetic energy

So $\frac{1}{2}mv^2=294.15$

$\frac{1}{2}\times 11\times v^2=294.15$

v =7.31 m/sec

So velocity final velocity will be 7.31 m/sec

4 0

4 years ago

Alan starts from his home and walks 1.3 km east to the library. He walks an additional 0.68 km east to a music store. From there

zepelin [54]

Answer: final Displacement = 0 km, total distance covered =7 km

Explanation:

Given the following :

From home to library = 1.3 km East

Library to music store = 0.68km East

Music store to friend's house = 1.1km North

Friend's house to grocery store = 0.42 km North

Displacement is the net change in distance traveled.

Eastward distance :

To = (1.3 + 0.68)km = 1.98km East

Fro = (0.68 + 1.3)km = 1.98 km East

Δ distance = (1.98 - 1.98) = 0

Northward direction:

To = (1.1 + 0.42)km = 1.52km north

Fro = (0.42 + 1.1)km = 1.52km North

Δ distance = (1.98 - 1.98) = 0

Hence final Displacement = 0

Total distance covered = 2 × (1.3 + 0.68 + 1.1 + 0.42) = 2 × 3.5

= 7km

3 0

4 years ago

Imagine Two Artificial Satellites Orbiting Earth At The Same Distance. One Satellite Has A Greater Mass Than The Other One? Whic

Zarrin [17]

1. B
It comes from Newton's law of universal gravitation.
,
 $F=G\frac{m_{1}m_{2}}{r^2}$ 

Where:
F is the force between the masses, (the one we are looking for)G is the gravitational constant,m1 is the first mass (Earth)m2 is the second mass (sattelite)r is the distance between the centers of the masses.As you can see except for m2, all other values are the same.
If mass is bigger the force grows.
2. D.
Again check the formula. The bigger distance, the smaller force. So, closer = bigger force.
3.C It will increase.Ohm's law:
$I= \frac{V}{R}$
Where:
I is the current.
V is voltage
R is the resistance.
In order for current to remain the same, while voltage increases, the resistance has to increase accordingly.

3 0

4 years ago