Answer:
The tension force has a magnitude of 490 N, and acts vertically upward
Explanation:
The complete question is:
A 50kg chandelier hangs from a ceiling suspended by a cable. What is the Tension (magnitude and direction of the force) in the cable?
ANS:
Tension is the force applied axially by rope, chain, cable, rod, etc, as a reaction force. The direction of tension is always towards the support. Since, the support here, is ceiling.
Therefore, the direction of tension force will be <u>vertically upward</u><u>.</u>
Since the chandelier is hanging stationary, without any motion. Thus, there must not be any unbalanced force applied on it.
Hence, the tension force must be equal to the weight of chandelier.
Tension Force = Weight of Chandelier
T = W = mg
T = (50 kg)(9.8 m/s²)
<u>T = 490 N</u>
<u>Thus, the tension force has a magnitude of 490 N, and acts vertically upward</u>
The speed of the car is 12 m/s.
Explanation:
As in the present problem, the frequency emitted by the source (f) is given as 570 Hz and the Doppler frequency or the frequency heard by the observer (f') is given as 590 Hz. So there is an increase in the frequency which confirms that the car is moving towards the observer. Then, the speed of the car can be obtained by substituting the known parameters in the Doppler shift frequency formula.
As the observer is stationary, the speed of observer is zero, so the numerator will only have the speed of sound which is 343 m/s. And as the car is coming towards the observer, the speed of car should be subtracted from the speed of sound in the denominator.
So, the speed of the car is 12 m/s.
Answer:Substances on the periodic table cannot be broken down into other substances and are therefore elements.
Periodic table is an arrangement of elements. This arrangement is based on the similar chemical and physical properties. Though elements can be broken down to subatomic particles like electrons, protons etc. but these cannot be broken down into other substances. Hence, all substances on the periodic table classified as elements.
Substances on the periodic table cannot be dissolved in water or other liquids: This is not true. Substances on the periodic table can be dissolved in water and other liquids. For example, Aluminium, Iron, Arsenic etc can dissolve in water.
All elements are pure substances: Even compounds are pure substances.
Substances on the periodic table can be combined to form compounds and are therefore elements: This is true but not the ultimate reason.