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4 years ago

Someone plz answer this quickly!!

Physics

1 answer:

Serjik [45]4 years ago

8 0

Answer:

B. In the same group

Explanation:

Elements in the same group shared chemical properties.

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At a certain moment, a car travelling at 40mph begins braking for a railroad crossing. Assume thatthe acceleration is constant (

egoroff_w [7]

Answer:

Part a)

$v_f = 17.88 - (0.15) t$

Part b)

$d = 1072.8 m$

Explanation:

As we know that initial speed of the car is

$v = 40 mph$

$v = 40 \times (\frac{1609}{3600})$

$v = 17.88 m/s$

now we have

$v_f = v_i + at$

$0 = 17.88 + a(120)$

$a = -0.15 m/s^2$

Part a)

As we know that acceleration is constant here

so we have

$v_f = v_i + at$

$v_f = 17.88 - (0.15) t$

Part b)

distance moved by the car is given as

$d = \frac{v_F + v_i}{2} t$

now we have

$d = \frac{0 + 17.88}{2}(120)$

$d = 1072.8 m$

3 0

3 years ago

How many mm equal 14m

Fed [463]

Answer:

14000 mm

Explanation:

multiply the length value by 1000

3 0

4 years ago

When placed in water does a pencil bend towards the normal or away from the normal?

Anarel [89]

Answer:

ni sin theta i = nr sin theta r where theta i is the angle of incidence and theta r the angle of refraction

For nr greater than ni (air to water) theta r must be smaller and the image would be bent towards the normal

7 0

3 years ago

Not so fast! If a force of 2500 N is used over

Masteriza [31]

Answer:

B 1500N

Explanation:

The acceleration of the car - at least the average one, but that will do, is $a= \frac{\Delta v}{\Delta t} = \frac 53 ms^{-2} = 1.66 ms^{-2}$

We know the acceleration, we know the force, let's drop them in Newton second law.

$F= ma = 2500= m \frac53 \rightarrow m=500\times 3 N = 1500N$

3 0

3 years ago

What is the smallest particle ionic compound

Lerok [7]

Answer:

this

Explanation:

Covalent compounds are formed when electrons are shared. The smallest particle in an ionic compound is an ion and the smallest particle in covalent compound are molecules.

8 0

4 years ago