Answer:
The first source of energy in a food chain is producer.
Explanation: In the food chain, the producer will be a plant that a primary consumer, a herbivore eats. The herbivore gets eaten by a secondary consumer, carnivorous. When the carnivore dies, it becomes energy for a decomposer.
"It <span>keeps the fish warm in the winter" is the choice among the choices given in the question that shows how it is helpful to fish that lives in a lake water. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has helped you.</span>
Answer:
The magnitude of the tension on the ends of the clothesline is 41.85 N.
Explanation:
Given that,
Poles = 2
Distance = 16 m
Mass = 3 kg
Sags distance = 3 m
We need to calculate the angle made with vertical by mass
Using formula of angle
We need to calculate the magnitude of the tension on the ends of the clothesline
Using formula of tension
Put the value into the formula
Hence, The magnitude of the tension on the ends of the clothesline is 41.85 N.
Answer:
1. B
2. C
3. B
4. A
5. D
Explanation:
The set of scenarios in this question depicts the NEWTONS THIRD LAW OF MOTION, which states that when an object 1 exerts an action force on an object 2, the object 2 exerts a reaction force that is opposite but equal in magnitude on object 1.
- In question 1, a ball (object 1) bounces on the ground (object 2). According to Newton in his third law, the ball and the ground exert forces on each other with equal magnitude but in opposite directions.
- In question 2, according to Newton third law of motion described above, If two moving objects collide, then they will move away from each other in opposite directions.
- In question 3, if two metal balls with the same mass hang so that they are touching each other. When the ball on the left is pulled to the side and released, it swings back and hits the ball on the right causing the ball on the right to move to the right while that on the left to move left (opposite directions).
- In question 4, bumper cars at an amusement park demonstrate third law of Newton in such a way that if two bumper cars collide with a certain force, then they will move away from each other in opposite directions with the same force.
- In question 5, when the octopus ejects the water out, the water acts with an equal force on the octopus in the opposite direction causing the octopus to propel itself through the water. This demonstrates Newton third law of motion.
Answer:
(A) 0.004 m^3
(B) 48.11 K
Explanation:
Work, W = 2100 J
Pressure, P = 1 x 10^5 Pa
V2 = 0.025 m^3
(A) let the initial volume of the gas is V1.
W = P (V2 - V1)
2100 = 1 x 10^5 (0.025 - V1)
0021 = 0.025 - V1
V1 = 0.025 - 0.021
V1 = 0.004 m^3
Thus, the initial volume of the gas is 0.004 m^3.
(B) Let the temperature of the gas is T
Use ideal gas equation
P1 x V1 = n x R T
1 x 10^5 x 0.004 = 1 x 8.314 x T
T = 48.11 K
Thus, the initial temperature of the gas is 48.11 K.
