Answer:
Sodium - D) Malleable, soft, and shiny
Sodium is an alkalyne metals that is why they are soft and sodium can cut by knife.
Silicon - C) Has properties of both metals and nonmetals
As we know that those materials have both nonmetals and metals properties are known as metaloid.
Bromine - A) Highly reactive gas
All halogens are so reactive .Because they are high electro negative element.Bromine(Br) is a halogen element.
Argon - B) Nonreactive gas
All noble gases are stable that is why they are not reactive with ant other element.So we can say that noble gas are Nonreactive gas.Argon(Ar) is noble gas.
Answer:
<u>44.2 N</u><u> </u><u>towards</u><u> </u><u>left</u>
<u>or</u>
<u>-</u><u>4</u><u>4</u><u>.</u><u>2</u><u> </u><u>N</u><u> </u><u>towards</u><u> </u><u>right</u>
Explanation:
pls refer attachment for detailed solution
Answer:
0.35 m
Explanation:
Constructive interference occurs when the difference in the distance between the two speakers is
0, λ, 2λ,...
Here λ = v/f = 343/490 = 0.7m
The first point of interference is the initial point which would mean the distance is the trivial solution of 0 .
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found.
Let x be the distance from the midpoint to the next interference.
This occurs when 1.5 + x -(1.5 - x) = 0.7
so 2x = 0.7 which means x = 0.7/2 = 0.35m
Answer:
The slowdown took 2.05 seconds and the roller coaster made a distance 20.5 during that time.
Explanation:
Start with the kinematic equation for velocity. Let v1 and v2 be the initial and the new velocity, respectively. Let s denote the distance made duringthe slowdown. Let m denote the mass of the roller coaster and "a" its acceleration (negative = deceleration). the equation is as follows:
Let us first determine the distance made:
The roller coaster made 20.5 meters during slowing down to 2 m/s. Now calculate the time this took.
It took 2.05 seconds to achieve the slowdown from 18 to 2 m/s
As the sphere moves in the liquid, it experiences a viscous force upwards that tries to resist its downward motion caused by gravity(it's own weight). This viscous force gradually increases with depth, as the speed rises(because the weight causes a positive acceleration in it's direction). At a point, the viscous force upwards becomes exactly equal to the weight downwards. Then the sphere reaches equilibrium. It doesn't have any external force acting on it, so it can't have any acceleration. So, it's velocity becomes constant, and this velocity is known as the terminal velocity.