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Pani-rosa [81]
3 years ago
12

A ball is thrown vertically upward. What is its acceleration right before it hits the earth?

Physics
2 answers:
Bezzdna [24]3 years ago
7 0
<span>The entire time the ball is in the air, its acceleration is 9.8 m/s2 down provided this occurs on the surface of the Earth. Note that the acceleration can be either 9.8 m/s2 or -9.8 m/s2.
[Please Mark as Brainliest]
</span>
Levart [38]3 years ago
4 0
It increases. Because it hasn't hit the ground yet.


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Sally is on a canoe that comes to a stop a small distance from the dock. Since it is such a small distance, Sally decides to jum
natita [175]

Answer:

 v₂> v₃  velocity canoe is more than velocity fishing boat

Explanation:

For this exercise we must define a system consisting of the girl, Sally and the boat, in one case the canoe and in the other the fishing boat; for this system we can use moment conservation

Initial moment. Before the jump

           p₀ = (M + m₂) v

Final moment. After the jump

          p_{f} = M v₁ - m₂ v₂

Where m and v are the masses and speed of the canoe

          p₀ = p_{f}

          (M + m₂) v = M v₁ - m₂ v₂

In the case of changing the canoe for the heaviest fishing boat, the final moment is

          p_{f} = M v₁ - m₃ v₃

          p₀ = p_{f}

           (M + m₃) v = M v₁ - m₃ v₃

Since the canoe is stopped the speed v = 0, we write the speed of each boat

Canoe

          0 = M v₁ - m₂ v₂

          v₂ = M / m₂ v₁

Fishing boat

        0 = M v₁ - m₃ v₃

        v₃ = M / m₃ v₁

Since the masses of the fishing boat (m₃) is greater than the mass of the canoe (m₂) the speed of the fishing boat is less than the speed of the canoe, we can find the relationship between the two speeds

        v₂ / v₃ = m₃ / m₂

Here you can see what  v₂> v₃  velocity canoe is more than velocity fishing boat

8 0
3 years ago
A wooden block with mass 1.05 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 35.0 deg
Svet_ta [14]

Answer:

Explanation:

energy stored in spring initially

= kinetic + potential energy of block + energy dissipated by friction

= 1/2 mv² + mgh + μ mgcosθ x  d

m is mass , v is velocity at top position , h is vertical height , μ is coefficient of friction ,θ is angle of inclination of plane

= m (1/2 v² + gh + μ gcosθ x  d )

= 1.05 ( .5 x 5.1² + 9.8 x 4.9 sin35 + .55 x 9.8 cos35 x 4.9 )

= 1.05 ( 13.005 + 27.543 + 21.635)

= 65.3 J .

4 0
3 years ago
3 Points Ricardo is going to take a flight from New York, New York, to Memphis, Tennessee. The flight leaves New York at 10:15 a
jek_recluse [69]

Answer:

2 hrs 45 minutes

Explanation:

You have to minus one hr because of tome change

3 0
3 years ago
Read 2 more answers
Two identical 0.200kg mass are pressed against opposite ends of a light spring of force constant 1.75N/cm compressing the spring
arlik [135]

This type of a problem can be solved by considering energy transformations. Initially, the spring is compressed, thus having stored something called an elastic potential energy. This energy is proportional to the square of the spring displacement d from its normal (neutral position) and the spring constant k:

E_p=\frac{1}{2}kd^2= \frac{1}{2}175\frac{N}{m}\cdot 0.37^2m^2=11.98J

So, this spring is storing almost 12 Joules of potential energy. This energy is ready to be transformed into the kinetic energy when the masses are released. There are two 0.2kg masses that will be moving away from each other, their total kinetic energy after the release equaling the elastic energy prior to the release (no losses, since there is no friction to be reckoned with).

The kinetic energy of a mass m moving with a velocity v is given by:

E_k = \frac{1}{2}mv^2

And we know that the energies are conserved, so the two kinetic energies will equal the elastic potential one:

E_p = 2E_k=mv^2

From this we can determine the speed of the mass:

E_p =mv^2\implies v=\pm \sqrt{\frac{E_p}{m}}=\pm\sqrt{\frac{11.98J}{0.2kg}}=\pm 7.74\frac{m}{s}

The speed will be 7.74m/s in in one direction (+), and same magnitude in the opposite direction (-).

4 0
3 years ago
What statement best describes his motion as he jogs around the curved part of the track?
-BARSIC- [3]

Answer:

The answer would be A.

Explanation:

5 0
3 years ago
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