Answer:
Here's what I get
Explanation:
A. Distance between A and B.
h = -½gt²
The stones go faster the farther they fall.
Stone A has already reached 5 m when B is released.
When B reaches 5 m, A has dropped further and is falling even faster.
The distance between the stones increases with time.
Figure 1 shows this effect in a graph of height vs. time.
B. Speed of Stone B
v² = 2gh =2 × ( -9.81 m·s⁻²) × (-5 m) = 98.1 m·s⁻²
v = 9.9 m/s
The stone is travelling at 9.9 m/s when it reaches 5 m.
C. Velocity vs time
v = -gt
Both stones accelerate at the same rate.
When Stone B has reached 10 m at time t, Stone A is falling much faster.
Fig. 2 shows this in a graph of velocity vs time.
Answer:
The crests of the sound wave are spaced closer together.
Explanation:
the wavelength between successive crests is decreased due to the motion of the truck in the same direction as the sound
Answer:
2127.04 J
Explanation:
Rotational kinetic energy can be calculated using the formula;
E(rotational) = 1/2 × I × ω²
Where;
I = moment of inertia
ω = angular velocity
However, the moment of inertia (I) can be calculated using the expression:
I = mr²
Where;
m = mass
r = radius/distance from axis of rotation
According to the provided information, r = 4m, ω = 3.4 rad/s, m = 23kg
I = mr²
I = 23 × 4²
I = 23 × 16
I = 368kg/m²
Hence, if I = 368kg/m², rotational kinetic energy will be:
K = 1/2 × I × ω²
K = 1/2 × 368 × 3.4²
K = 184 × 11.56
K = 2127.04 J
Answer: c. 1.89 x 10^14 J
Explanation:
By Einstein's equation, we know that:
E = m*c^2
Where m is the mass-consumed in this case:
m = 2.10g
And we must rewrite this in Kg, knowing that:
1kg = 1000g
Then:
m = 2.10g = (2.10/1000) kg = 0.0021 kg
And c is the speed of light:
c = 3*10^8 m/s.
Then the energy will be:
E = 0.0021 kg*(3*10^8 m/s)^2 = 1.89*10^14 Joules.
The correct option is:
c. 1.89 x 10^14J
Parasitism means harming an organism, so fleas live in a dog’s fur and drink its blood would be the correct answer :)