Answer:
True
Explanation:
The main differences between a physical property and a chemical property are mentioned below:
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.
While A chemical property describes the ability of a substance to undergo a specific chemical change.
Magnetic force:Computer hard drives use magnetism to store the data on a rotating disk. More complex applications include: televisions, radios, microwave ovens, telephone systems, and computers. ... Frictional force:Quite often uses of friction can be seen from how things would be without friction.
Answer:
The power of sports car is 25 times power of older model car
Explanation:
Consider mass of the two cars are same and is denoted by m.
Kinetic energy of older model car is determine by the relation:
Kinetic energy of sports car is determine by the relation:
....(1)
Power is defined as energy per unit time.
According to the problem, the car has only kinetic energy. So, the power of old model and sports car are determine by the relation:
and
Here P₁ and P₂ are the power of old model and sports car respectively.
The ratio of power of these car is:
Substitute equation (1) in the above equation.
Answer:
Explanation:
A )
The ball floats with half of it exposed above the water level . So it must have density half that of water . In other words its density must have been 500 kg / m³
B )
Tension in the ball will be equal to net force acting on the ball
Net force on the ball = buoyant force - weight .
4/3 x π x .21³ x 10⁻⁶ x 9.8 ( 1000 - 893 )
= 40.65 x 10⁻⁶ N .
C )Tension in the 3 rd ball will be equal to net force acting on the ball
Net force on the ball = weight - buoyant force
= 4/3 x π x .21³ x 10⁻⁶ x 9.8 ( 1320 - 1000 )
= 121.6 x 10⁻⁶ N .
Answer:
10seconds
Explanation:
use the formula a=v final_v inital/time