2.57487254877 × 
To write a number in scientific notation, first write a decimal point in the number so that there is only 1 digit to the left of the decimal point.
Next, count the number of places the decimal point would need to move to get back to the original number.
The exponent is positive because we would need to move the decimal point to the right to get back to our original number.
Image provided.
Answer: 8m/s^2
Explanation:
By Newton's second law we have that.
F = m*a
Where F is force, m is mass and a is acceleration.
We know that m = 50kg and F = 400N
400N = 50kg*a
a = (400/50) m/s^2 = 8m/s^2
The photosynthesis equation is :
H2O + CO2 + sunlight (energy) > C6H12O6 + O2
So water (H2O) and carbon dioxide (CO2) are the raw materials need for photosynthesis.
Answer:
Explanation:
The expression for kinetic energy is:
K.E. is the kinetic energy = 
m is the mass = 4 g = 0.004 kg (As 1 g = 0.001 kg)
v is the velocity
Applying values as:
Input = 2,150 J; Output = 750 J
The efficiency of the engine = Output / Input = 750 J / 2,15 J = 0.3488
Answer: 0.3488 or 34.88 %
