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7nadin3 [17]
3 years ago
12

Magnets use ---- to attract to some objects

Physics
2 answers:
drek231 [11]3 years ago
8 0

Answer:

magnets are used to attract metal objects.

Explanation:

RideAnS [48]3 years ago
7 0

Answer:

magnets use electrical attraction to attract to some objects aka they use magnetic fields or just fields

plz vote fairly

Explanation:

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With what speed must you approach a source of sound to observe a 25% change in frequency?
insens350 [35]
Sound source is at rest, you are moving with velocity v, f = frequency, c = speed of sound:

f = f0(1 + v/c)

115 = 100(1 + v/343)
115 = 100 + 100v/343
15 = 100v/343
v = 15*343/100
<span> v = 51,45 m/s </span>
5 0
3 years ago
PLEASE HELP! I don't get it at all! Speed is one thing; distance is another. Where is the arrow you shoot up at 50m/s when it ru
LuckyWell [14K]
I got you b, V(final)^2=V(initial+2acceleration*displacement
So this turns to (0m/s)^2=(50m/s)^2+2(9.8)(d) so just flip it all around to isolate d so you get
-(50m/s)^2/2(9.8) = d so you get roughly 12.7555 meters up
4 0
3 years ago
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Deserts (especially true deserts) are not easy places for animals to live. Animals who live in them often have special features
mart [117]

Answer:

tolerate heat

Explanation:

5 0
3 years ago
An apple with mass 0.4 kg is hanging at rest from the lower end of a light vertical rope. A dart of mass 0.1 kg is shot vertical
Sholpan [36]

Answer:

The speed of the apple just after the collision is 1m/s

Explanation:

Since the two bodies collided, we will apply the law of conservation of momentum to find their common velocity which states that the sum of momentum of the bodies before collision is equal to the sum of momentum of the bodies after collision. After collision both bodies will move with a common velocity v.

Given momentum = mass × velocity

Initial momentum of the 0.4kg apple hanging at rest will be;

Momentum = 0.4kg×0m/s = 0kgm/s (the velocity of apple is 0m/s since it is hanging at rest)

Initial momentum of the 0.1kg dart moving with speed of 5m/s will be;

Momentum of dart = 0.1kg × 5m/s

Momentum of dart = 0.5kgm/s

Momentum of the bodies after collision will give;

Momentum after collision = (0.4kg+0.1kg) × v (v is their common velocity)

Momentum after collision = 0.5v

Using the law of conservation of momentum to calculate their common velocity, we will have;

0+0.5 = 0.5v

0.5 = 0.5v

v = 0.5/0.5

v = 1m/s

Therefore the speed of both bodies after collision is 1m/s which will also serve as the speed of the apple after collision.

5 0
3 years ago
Read 2 more answers
A 28 kg mass suspends from a light rope 18 m long &amp; is held to one side by the horizontal force, F, as shown below.
frutty [35]

Answer: 215.15 N

Explanation:

If we draw a free body diagram of the mass we will have the following:

\sum{F_{x}}=-Tcos\theta + F=0 (1)

\sum{F_{y}}=Tsin\theta - mg=0 (2)

Where T is the tension force of the rope, m=28 kg the mass, g=9.8 m/s^{2} the acceleration due gravity and mg is the weight.

On the other hand, we can calculate \theta as follows:

cos\theta=\frac{s}{l}

\theta=cos^{-1}(\frac{s}{l})

Where s=11.1 m and l=18 m

\theta=cos^{-1}(\frac{11.1 m}{18 m})

\theta=51.9\° (3)

Now, we firstly need to find T from (2):

T=\frac{mg}{sin\theta} (4)

T=\frac{(28 kg)(9.8 m/s^{2})}{sin(51.9\°)}

T=348.69 N (5)

Substituting (5) in (1):

F=Tcos\theta (6)

F=348.69 N cos(51.9\°)

Finally:

F=215.15 N

8 0
3 years ago
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