Answer:
V = 5.4 m/s
Explanation:
It is given that,
Let mass of the block, m = 10 kg
Spring constant of the spring, k = 2 kN/m = 2000 N/m
Speed of the block, v = 6 m/s
Compression in the spring, x = 15 cm = 0.15 m
Let V is the speed of the block moving at the instant the spring has been compressed 15 cm. It can be calculated using the conservation of energy of spring mass system.
V = 5.61 m/s
From the given options,
V = 5.4 m/s
Hence, this is the required solution.
Answer:
B) alternating current
Explanation:
Alternating currents are different from direct current. These form of currents are used to transport power from generating stations over large distances.
- Alternating current is a current that reverses direction periodically.
- The voltage also reverses and leads to little loss in voltage.
- This current reversal makes them desirable for long distance transmission coupled with the little loss in voltage.
- Transformers used to change the voltage of these wave forms.
- The lesser loss in voltage makes AC desirable for long distance transmission.
Answer:
c. density decreases because the molecules move farther apart
Explanation:
As a liquid is heated, the molecules move faster and move farther apart. This causes the volume to increase, which causes the density to decrease.
The answer is: [D]: "have rings and bands" .
_________________________________________________
Explanation:
here's the answer, shouldn't be too hard to get the rest now!
4. f
5. t
6. t
7. t
8. f
9. t
10. f