Answer:
Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.
source britannica
Explanation:
Answer:
Explanation:
According to Newton's second law, we have:
The force of friction is opposite to the motion of the block.
Using the following kinematic equation, we can calculate the distance traveled by the block before it stops().
Solving for x and replacing a from (1):
Answer:
Metals produce electrons ( photoelectrons ) when exposed to light.
Explanation:
These photoelectrons produce photocurrent and this was proved by Eistein illustration of photocurrent and stopping potential.
Distance = rate * time
d = (20.0 mph)(0.500 hr) + (40.0 mph)(1.00 hr) + (30.0 mph)(0.500 hr) + (50.0 mph)(2.00 hr)
d = 10.0 miles + 40.0 miles + 15.0 miles + 100. miles
d = 165 miles
Answer:
<h3>The answer is 20 N</h3>
Explanation:
The force acting on an object can be found by using the formula
<h3>force = mass × acceleration</h3>
From the question
mass = 1000 g = 1 kg
acceleration = 20 m/s²
We have
force = 20 × 1
We have the final answer as
<h3>20 N</h3>
Hope this helps you