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Artemon [7]
4 years ago
12

A student throws a rock upwards. The rock reaches a maximum height 2.4 seconds after it was released.

Physics
1 answer:
Allisa [31]4 years ago
7 0

Answer:

23.52 m/s

Explanation:

The following data were obtained from the question:

Time taken (t) to reach the maximum height = 2.4 s

Acceleration due to gravity (g) = 9.8 m/s²

Initial velocity (u) =..?

At the maximum height, the final velocity (v) is zero. Thus, we can obtain how fast the rock (i.e initial velocity)

was thrown as follow:

v = u – gt (since the rock is going against gravity)

0 = u – (9.8 × 2.4)

0 = u – 23.52

Collect like terms

0 + 23.52 = u

u = 23.52 m/s

Therefore, the rock was thrown at a velocity of 23.52 m/s.

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A 2.0 kg block is pulled across a horizontal surface by a 15 N force at a constant velocity.a. What is the net force acting on t
bixtya [17]

Answer:

0

Explanation:

the block is being pulled at a constant velocity meaning it has no acceleration. the rule is fnet=mass x acceleration so if theres no acceleration there is no force net!

8 0
3 years ago
Marie curie was a scientist who won two nobel prizes in the early 1900s for her work with.
Arada [10]

She remains the only person to be honored for accomplishments in two separate sciences. Curie received the Nobel Prize in Physics in 1903, <u>along with her husband and Henri Becquerel, </u>for their work on radioactivity.

<h3>What did Marie Curie discover?</h3>

Relentless regardless of a vocation of truly requesting and at last lethal work, she found polonium and radium, supported the utilization of radiation in medication and essentially changed how we might interpret radioactivity. Curie was conceived Marya Skłodowska in 1867 in Warsaw.

  • Curie was the first person to win two Nobel Prizes.
  • She managed it all without a fancy lab.
  • Nobel Prizes were a family affair.
  • Curie was the first female professor at Sorbonne University.
  • Curie is buried in the Panthéon in Paris.

To learn more about Marie Curie from the given link

brainly.com/question/1160057

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4 0
1 year ago
a concrete slab 20 m long and weighing 400,000 N is supported by one pillar. A 19,600 N car is parked 8 meters from one end, whe
Elden [556K]

let the distance of pillar is "r" from one end of the slab

So here net torque must be balance with respect to pillar to be in balanced state

So here we will have

Mg(r - L/2) = mg(L/2 - 8)

here we know that

mg = 19600 N

Mg = 400,000 N

L = 20 m

from above equation we have

400,000(r - 10) = 19,600 (10 - 8)

r - 10 = 0.098

r = 10.098 m

so pillar is at distance 10.098 m from one end of the slab

3 0
3 years ago
Question 1 (1 point)
Dmitry [639]

1). trajectory

2). person sitting in a chair

3). 490 meters

4). 65 m/s

5). False.  The projectile's displacement, velocity, and acceleration have vertical and horizontal components, but the projectile doesn't.

6). False

7). The vertical component of a projectile doesn't change due to gravity, but the vertical components of its displacement, velocity, and acceleration do.

The vertical components do NOT equal the horizontal components.

8). Decreasing if you include the effects of air resistance.  Constant if you don't.  Gravity has no effect on horizontal velocity.

9). We can't see the simulation.  But if the projectile doesn't have jets on it, then as it travels upward, its vertical velocity must decrease, because gravity is trying to not let it get away.

10). We can't see the simulation.  But if the projectile is traveling downward, we would call that "falling", and its vertical velocity must increase, because gravity is pulling it downward.

6 0
4 years ago
Read 2 more answers
A rock is placed on a balance and its mass is determined as 18.3 g. When the rock is then placed in a graduated cylinder that or
Crank

Answer : The density of rock reported should be, 3.1 g/mL

Explanation :

Mass of rock = 18.3 g

Original volume of water = 11.1 mL

New volume of water = 17.0 mL

First we have to calculate the volume of rock.

Volume of rock = New volume of water - Original volume of water

Volume of rock = 17.0 mL - 11.1 mL

Volume of rock = 5.9 mL

Now we have to determine the density of rock.

Formula used :

\text{Density of rock}=\frac{\text{Mass of rock}}{\text{Volume of rock}}

\text{Density of rock}=\frac{18.3g}{5.9mL}=3.1g.mL

Thus, the density of rock reported should be, 3.1 g/mL

8 0
4 years ago
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