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KiRa [710]
3 years ago
8

How many electrons are in the element that comes just before platinum in the periodic table?

Physics
1 answer:
laila [671]3 years ago
7 0

The element is iridium and it has 77 electrons

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A boat heads north at 30 mph while a steamer heads east at 40 mph at the same time. When is the distance between them 50 mi? Ans
Reil [10]

Answer:

1 hour

Explanation:

Speed of the first boat = 30 mph

Speed of the second = 40 mph

The boats will cover different distances but the time taken will be the same.

Time taken by the boats = t

Distance = Speed × Time

Distance covered by the first boat = 30t

Distance covered by the second boat = 40t

Distance between the boats = 50 mi

From the Pythagoras theorem

\sqrt{(30t)^2+(40t)^2}=50\\\Rightarrow \sqrt{2500t^2}=50\\\Rightarrow 50t=50\\\Rightarrow t=\frac{50}{50}=1\ hour

Time taken by the boats when they are 50 mi away is 1 hour

7 0
3 years ago
Plz answer these two questions. I am so sick.if u ddo it would mean a lot.
faltersainse [42]
Gurlll same I hate physics
4 0
3 years ago
The revolution of the earth around the sun demonstrate what motion?​
olga2289 [7]

Answer:

Anticlockwise directions

Please mark me Brainliest to help me

3 0
1 year ago
What is the differ of fermentation from respirstion
Andrej [43]
This may help u... :P

8 0
3 years ago
A particle of mass moves under a force given bywhere and are unit vectors in the and directions. The particle is placed at the o
krek1111 [17]

The elapsed time when the particle returns to the origin is determined from the ratio of initial velocity and acceleration of the particle.

<h3>Time of motion of the particle</h3>

The time of motion of the particle is calculated by applying Newton's second law of motion.

F = ma

F = m(v)/t

where;

  • t is time of motion of the particle
  • m is mass of the particle
  • v is velocity of the particle

a = v - u/t

v = u + at

when the particle returns to the origin, direction of u, = negative.

final velocity = 0

0 = -u + at

at = u

t = u/a

Learn more about force here: brainly.com/question/12970081

#SPJ11

4 0
2 years ago
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