Answer:
The second student with mass 70kg has more momentum
Explanation:
Using the formula:
p = m × v
Where;
p = momentum (kgm/s)
m = mass (kg)
v = velocity (m/s)
According to this question, two students are running in a cross country race.
Student 1 has the following; m = 60kg, v = 7m/s
Student 2 has the following; m = 70kg, v = 7m/s
Using p = mv
Student 1, p = 60 × 7 = 420 kgm/s
Student 2, p = 70 × 7 = 490 kgm/s
From the result of the above calculations, student 2 with mass 70kg has more momentum.
Answer for number 1. Weight is the force of gravity. It acts in a downward direction—toward the center of the Earth.
Lift is the force that acts at a right angle to the direction of motion through the air. Lift is created by differences...
Thrust is the force that propels a flying machine in the direction of motion. Engines produce thrust.
2. For an airplane to takeoff, thrust must be greater than drag and lift must be greater than weight. To maintain level flight, lift must equal weight and thrust must equal drag. For landing, thrust must be less than drag, and lift must be less than weight.
3.When the forward forces are bigger than the opposing forces, you speed up (accelerate). As you go faster, the force of air resistance pushing back on you increases. Eventually, the forces become balanced (the forward forces are the same size as the opposing forces). Once the forces become balanced, your speed stays the same.
4.Every object on Earth has weight, a product of both gravity and mass. A Boeing 747-8 passenger airliner, for instance, has a maximum takeoff weight of 487.5 tons (442 metric tons), the force with which the weighty plane is drawn toward the Earth.
Answer:
I think c) laying on an air mattress
Answer:
6.55 mL of K₃PO₄ are required
Explanation:
We need to propose the reaction, in order to begin:
2K₃PO₄ (aq) + 3NiCl₂(aq) → Ni₃(PO₄)₂ (s) ↓ + 6KCl (aq)
Molarity = mol/L (Moles of solute that are contained in 1 L of solution.)
M = mol / volume(L). Let's find out the moles of chloride:
- We first convert the volume from mL to L → 187 mL . 1L / 1000mL = 0.187L
0.0184 M . 0.187L = 0.00344 moles of NiCl₂
Ratio is 3:2. Let's propose this rule of three:
3 moles of chloride react with 2 moles of phosphate
Then, 0.00344 moles of NiCl₂ will react with (0.00344 . 2) /3 = 0.00229 moles of K₃PO₄
M = mol / volume(L) → Volume(L) = mol/M
Volume(L) = 0.00229 mol / 0.350 M = 6.55×10⁻³L
We convert the volume from L to mL → 6.55×10⁻³L . 1000mL /1L = 6.55 mL
