Answer:
True
Explanation:
Velocity is a vector, therefore it consists of two elements:
- A magnitude (also called speed), which is the ratio between the displacement of the object and the time taken
- A direction, which corresponds to the direction of motion of the object
Therefore, velocity can be describes as positive or negative, depending on the direction which has been chosen as positive. If we chose the positive x-axis as positive direction, therefore:
- if the object is moving to the right (positive x-direction), the velocity will be positive
- if the object is moving to the left (negative x-direction), the velocity will be negative
So, in this case, since the velocity of the cart is negative, it must be moving to the left.
Answer:
Explanation:
When he accelerates the heavy object up , the reading increases because an extra downward normal force acts on it, then scale reading returns to the same reading as when standing stationary, and then decreases as although he is lifting the heavy object , the acceleration is decreasing ,so the extra upward normal force acts.
Answer:
Covalent.
Explanation:
Carbon and Sulfur are both nonmetals.
Nonmetal+nonmetal= covalent compound.
c because a generator generates electricity with the use of another energy source like nuclear,solar,wind,fossil fuel,gasoline or in rare cases temperature
Answer:
F = 2.30 10⁴ N
Explanation:
The force required to link two gates must be equal to or greater than the electrostatic force of repulsion, because the protons have equal charges.
F = k q₁ q₂ / r²
Where k is the Coulomb constant that is worth 8.99 10⁹ N m² / C²
In this case the proton charge is 1.6 10⁻¹⁹ C and the distance between them is approximately the diameter of the core r = 10⁻¹⁵ m
Let's calculate
F = 8.99 10⁹ (1.6 10⁻¹⁹)² / (10⁻¹⁵)²
F = 2.30 10⁴ N
The bond strength must be equal to or greater than this value
