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3 years ago

What is the acceleration of a 7 kg mass if the force of 70 N is used to move it toward the Earth?

Physics

1 answer:

Assoli18 [71]3 years ago

4 0

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

$a = \frac{f}{m} \\$

m is the mass

f is the force

From the question we have

$a = \frac{70}{7} = 10 \\$

We have the final answer as

Hope this helps you

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A permanent magnet creates a magnetic field at the origin with strength Bperm-1T. A current-carrying wire is oriented such that

bazaltina [42]

Answer:

Part a)

$B_{net} = (1 + 4 \times 10^{-6})T$

Part b)

$B_{net} = (1 - 4 \times 10^{-6})T$

Explanation:

Part a)

Since the two magnetic field is in same direction

so the net magnetic field is algebraic sum of magnetic field due to both

so here magnetic field of wire is given as

$B = \frac{\mu_0 i}{2\pi r}$

here we know that

I = 2 A

r = 5 cm

so we will have

$B = \frac{2 \times 10^{-7} (2)}{0.05}$

$B = 4 \times 10^{-6} T$

So net magnetic field is given as

$B_{net} = (1 + 4 \times 10^{-6})T$

Part b)

When direction of current is reversed then the direction of magnetic field is also reversed

So we will have

$B_{net} = (1 - 4 \times 10^{-6})T$

8 0

3 years ago

________ found that electric and magnetic energy move in waves.

GrogVix [38]

<span>James Clerk Maxwell is the answer</span>

8 0

4 years ago

A 3.00 x 10^2-W electric immersion heater is

andre [41]

Answer

t = 367.77 s = 6.13 min

Explanation:

According to the law of conservation of energy:

$Heat\ Supplied\ By \ Heater = Heat\ Absorbed\ by\ Glass + Heat\ Absorbed\ by\ Water\\Pt = m_gC_g\Delta T_g + m_wC_w\Delta T_w\\$

where,

P = Electric Power of Heater = 300 W

t = time required = ?

m_g = mass of glass = 300 g = 0.3 kg

m_w = mass of water = 250 g = 0.25 kg

C_g = speicific heat of glass = 840 J/kg.°C

C_w = specific heatof water = 4184 J/kg.°C

ΔT_g = ΔT_w = Change in Temperature of Glass and water = 100°C - 15°C

ΔT_g = ΔT_w = 85°C

Therefore,

$(300\ W)(t) = (0.3\ kg)(840\ J/kg.^oC)(85^oC)+(0.25\ kg)(4184\ J/kg.^oC)(85^oC)\\$

8 0

3 years ago

Nimfa-mama [501]

Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.

<h3>What are living and nonliving things?</h3>

They both consist of fundamentally simple building blocks. They are composed of substance or mass. Atmospheric and molecular building blocks make up the world.

The differences between how living and non-living things fly;

1. Moving both living and non-living objects consumes energy. Flying animals utilize their wings to create both lift and propulsion by moving them in relation to the body.

In contrast to most air vehicles where the components that generate lift wings and thrust engines or propellers are distinct and the wings stay stationary.

Animal aviators like birds as well as natural parachuters like patagial as well as human inventions like aircraft as well as rockets that can power spacecraft and spaceplanes are just a few examples of the many things that can fly.

Hence there are similarities and differences between how living and non-living things fly.

To learn more about the living and nonliving things refer;

brainly.com/question/7807759

#SPJ1

7 0

2 years ago

A large blue marble of mass 3.5 g is moving to the right with a velocity of 15 cm/s. The large marble hits a small red marble of

Aneli [31]

Explanation:

Let's solve the problem by using conservation of momentum:

m1 u1 + m2 u2 = m1 v1 + m2 v2

where:

m1 = 3.5 g is the mass of the blue marble

m2= 1.2 g is the mass of the red marble

u1 = 15 cm/s is the initial velocity of the blue marble

u2 = 3.5 cm/s is the initial velocity of the red marble

v1 = 5.5 cm/s is the final velocity of the blue marble

We can find the final velocity of the red marble by re-arranging the equation and solving for v2 :

v2 = 1/m²(m1 u1 + m2 u2 - m1 v1)=

=1/1.2(3.5×15+1.2×3.5−3.5×5.5 )=31cm/s

7 0

4 years ago