Ask question

Ask question

All categories

3 years ago

10

An element located at the intersection of period 7 and group 2

1 answer:

Flura [38]3 years ago

4 0

Answer:

the answer is Ra 88 (radium)

You might be interested in

The maximum heart rate during exercise for a 40 year old is

irina1246 [14]

<span>Target HR Zone 50-85% would be </span>90-153 beats per minuet. The average maximum heart rate 100% is 180 beats per minuet.

4 0

3 years ago

Help me please i need this to passsss

mamaluj [8]

Answer: D

Explanation: : ⊇

6 0

3 years ago

Sound travels at 343 m/s through dry air. If a lightening bolt strikes the ground 2 km away from you, how long will it take for

Minchanka [31]

Answer:

0.006 km / m/s

Explanation:

divide 343 m/s and 2 km

4 0

2 years ago

The San Andreas Fault in California exists along a _____ plate boundary.

allochka39001 [22]

The answer should be transform

5 0

4 years ago

If the block is subjected to the force of F = 500 N, determine its velocity at s = 0.5 m. When s = 0, the block is at rest and t

STatiana [176]

Answer:

The velocity is $4.6 m/s^2$

Explanation:

Given:

Force = 500N

Distance s= 0

To find :

Its velocity at s = 0.5 m

Solution:

$\sum F_{x}=m a$

$F\left(\frac{4}{5}\right)-F_{S}=13 a$

$500\left(\frac{4}{5}\right)-\left(k_{s}\right)=13 a$

$400-(500 s)=13 a$

$a = \frac{400 -(500s)}{13}$

$a = (30.77 -38.46s) m/s^2$

Using the relation,

$a=\frac{d v}{d t}=\frac{d v}{d s} \times \frac{d s}{d t}$

$a=v \frac{d v}{d s}$

$v d v=a d s$

Now integrating on both sides

$\int_{0}^{v} v d v=\int_{0}^{0.5} a d s$

$\int_{0}^{v} v d v=\int_{0}^{0.5}(30.77-38.46 s) d s$

$\left[\frac{v^{2}}{2}\right]_{0}^{2}=\left[\left(30.77 s-19.23 s^{2}\right)\right]_{0}^{0.5}$

$\left[\frac{v^{2}}{2}\right]=\left[\left(30.77(0.5)-19.23(0.5)^{2}\right)\right]$

$\left[\frac{v^{2}}{2}\right]=[15.385-4.807]$

$\left[\frac{v^{2}}{2}\right]=10.578$

$v^{2}=10.578 \times 2$

$v^{2}=21.15$

$v = \sqrt{21.15}$

$v = 4.6 m/s^2$

8 0

3 years ago