Answer:
Labor Day Weekend--No School
9/1/2021
Hello Students!
There will be no School on Friday Sept 3 and Monday Sept 6
All centers will be closed on Friday 9/3 and Monday 9/6
School will resume on TUESDAY, Sept 7
Enjoy your long weekend!
Explanation:
Labor Day Weekend--No School
9/1/2021
Hello Students!
There will be no School on Friday Sept 3 and Monday Sept 6
All centers will be closed on Friday 9/3 and Monday 9/6
School will resume on TUESDAY, Sept 7
Enjoy your long weekend!
Answer: The answer is A. Chemical
Explanation:Your hands get warm by fire because chemical energy gets converted into heat energy. When the chemical bonds in the wood are released in the air which then mixes with oxygen and emit heat.
Answer:
The change in momentum = -20000 kg m/s.
Explanation:
Mass m = 1000 kg
speed v₁ = 20 m/s
speed v₂ = 0 m/s
We know that,
The change in momentum
ΔP = m (Δv)
ΔP = m (v₂ - v₁)
= 1000 (0 - 20)
= 1000 (-20)
= -20000 kg m/s
Thus, the change in momentum = -20000 kg m/s.
Note: negative sign indicates that the velocity is reducing when it hits the barrier.
Answer:
r₂ = 0.2 m
Explanation:
given,
distance = 20 m
sound of average whisper = 30 dB
distance moved closer = ?
new frequency = 80 dB
using formula

I₀ = 10⁻¹² W/m²
now,



to hear the whisper sound = 80 dB



we know intensity of sound is inversely proportional to square of distances



r₂ = 0.2 m
Answer:
A and c, hope i helped xx
Explanation: