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3 years ago

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Physics

1 answer:

SVEN [57.7K]3 years ago

5 0

Explanation:

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The velocity of a ball as it is thrown up is 20 meters/second. It attains zero velocity after 3.5 seconds. What is the average a

Step2247 [10]

Change in speed = (speed at the end) minus (speed at the beginning)

= (0 - 20 m/s) = -20 m/s

Acceleration = (change in speed) / (time for the change)

= (-20 m/s) / (3.5 sec) = -5.71 m/s²

Notice that this story probably didn't happen on Earth, because
the acceleration due to gravity on Earth is 9.8 m/s².

3 0

3 years ago

A person drops a pebble of mass m1 from a height h, and it hits the floor with kinetic energy KE. The person drops another pebbl

Leona [35]

<h2>Answer:</h2>

<em>Hello, </em>

<h3><u>QUESTION)</u></h3>

<em>✔ We have: KE = PE (potential energy) </em>

The potential energy that the pebble of mass 1 has is called PE1 and the potential energy that the pebble of mass 2 has is called PE2

PE1 = PE2 ⇔ PE1/PE2 = 1

$\frac{m_1\times g\times h}{m_2\times g\times 4h} = 1 \\ \\ \frac{m_1}{m_2\times 4} = 1 \\ \\ \frac{m_1}{m_2} = 4$

The mass m1 is therefore 4 times greater than that of the stone of mass m2.

8 0

3 years ago

A suitcase has mass of 4.1 kg and sits on a counter 1.8 m high in the airport. How much gravitational potential energy does it h

velikii [3]

Answer:

72.324 J

Explanation:

Formula for gravitational potential energy is given by;

GPE = mgh.

Where;

m = mass

g = acceleration due to gravity

h = height

We are given;

m = 4.1 kg

h = 1.8 m

Thus;

GPE = 4.1 × 9.8 × 1.8 = 72.324 J

5 0

3 years ago

A factor that determines the inertia of an object is

lilavasa [31]

the mass of the object determines the amount of inertia in an object

6 0

4 years ago

The amino and carboxyl functional groups tend to form bases and acids by attracting or droppingA) an electron.B) a neutron.C) a

statuscvo [17]

Explanation:

When a substance or chemical specie accepts a proton then an acid is formed. Whereas is a substance or chemical specie tends to lose a proton then a base is formed.

Chemical formula of amino group is $-NH_{2}$ and it is able to lose a proton to form R-NH-R'. When it tends to gain a proton the it form R-NH_{3} compound.

Chemical formula of carboxylic group is -COOH. When it loses a proton it forms $-COO^{-}$ ion and whenit gains an electron then it forms $-O-C-OH_{2}$ .

Therefore, we can conclude that the amino and carboxyl functional groups tend to form bases and acids by attracting or dropping a proton.

7 0

3 years ago