1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
DanielleElmas [232]
4 years ago
15

if a bullet fired beneath the water, straight up, breaks through the surface at a speed of 25m/s, how high will the bullet be af

ter 2.8 seconds? what is the bullet's velocity at this time? (accelaration of 9.8m/s)
Physics
1 answer:
Doss [256]4 years ago
8 0

Answer:

32 m and -2.4 m/s

Explanation:

Given:

v₀ = 25 m/s

t = 2.8 s

a = -9.8 m/s²

Find: Δy, v

Δy = v₀ t + ½ at²

Δy = (25 m/s) (2.8 s) + ½ (-9.8 m/s²) (2.8 s)²

Δy = 31.6 m

v = at + v₀

v = (-9.8 m/s²) (2.8 s) + 25 m/s

v = -2.44 m/s

Rounded to two significant figures, the bullet reaches a height of 32 m and a velocity of -2.4 m/s.

You might be interested in
What is the relationship between the strength of a bond (single vs double vs triple) and its wave-number on an IR spectrum? As t
Elanso [62]

<u>Explanation</u>

  • The relationship between the strength of a bond (single vs double vs triple) and its wave-number on an IR spectrum as the bond strength increases the wave number increases.

                STRENGTH OF BONDS TRIPLE>DOUBLE>SINGLE

                WAVE NUMBER SINGLE>DOUBLE>TRIPLE

  • wave number for single bond is greatest because it has greatest bond frequency among the three( more the frequency greater is the wave number).

8 0
3 years ago
Clothes stick together when you pull them out of the dryer because
dusya [7]
It is because of static electricity
5 0
3 years ago
Need an answer, please need an answer, please​
Karolina [17]

9514 1404 393

Answer:

  • moderate low: 82
  • moderate high: 112.75
  • vigorous low: 123
  • vigorous high: 174.25

Explanation:

When calculations are repetitive, I find it convenient to use a calculator that can work with tables.

The PMHR is (220 -15) = 205.

Each of the other heart rates is computed as the formula shows. For example, the low moderate heart rate is 205×0.40 = <u> 82 </u> bpm

The other rates are shown in the attached table. They are computed the same way.

6 0
3 years ago
16) A man ran a 5 mile race. The race looped around a city park and back
finlep [7]

Answer:

The man's total displacement is equal to 0.

Explanation:

Given that,

A man ran a 5 mile race. The race looped around a city park and back  to the starting line.

We need to find the total displacement of the man.

We know that,

Displacement = shortest path covered

Also,

Displacement = final position - initial position

As it reaches back to its starting line, it means, the displacement is equal to 0.

Hence, the man's total displacement is equal to 0.

3 0
3 years ago
Rubidium forms the positive ion Rb+. Does this ion have more or fewer electrons than the neutral atom?
ohaa [14]

Answer:

The ion has fewer electrons

Explanation:

As Rubidium forms a positive ion Rb⁺ the number of electrons becomes fewer for the atom.

  • A positive charge on an ion indicates that the number of protons for the atom is greater than the number of electrons.
  • This leaves a net positive charge on the atom.
  • For a negatively charged ion, the number of electrons is more than the number of protons because they have gained additional electrons.
  • In a neutral atom, the number of protons and electrons are the same.
7 0
3 years ago
Other questions:
  • 1 . A farmer moves along the boundary of his rectangular field of side 10m x 20m . farmer covers 1m in 1sec . what will be the m
    8·1 answer
  • A person standing in the moon's "blank" would see a total solar eclipse ​
    12·2 answers
  • When an object with a negative charge is moved from point A to point B through an external electrical field, it gains electrical
    15·1 answer
  • Acceleration is best defined as the rate of change of what object?
    15·1 answer
  • Which of the following statements are true concerning a stable nucleus?Check all that apply..There is a limit to the size of a s
    11·1 answer
  • What is one characteristic of informal writing?
    10·2 answers
  • How high must you lift a 25 Newton book for it to have the same increase in potential energy as a 20 Newton book that was lifted
    12·1 answer
  • Why do specific heat capacity of objects differ ?​
    10·2 answers
  • What is types of motion ​
    13·2 answers
  • Has anyone done the science project: modeling waves/properties of light?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!