Answer:
<u>10 J</u>
Explanation:
work = force x distance
work = 5x2
work = 10 J
Joule is the unit for work
Answer:
1428.6m/s²
Explanation:
Given parameters:
Force applied on the body = 40N
Mass of the body = 28g
1000g = 1kg
28g will therefore be 0.028kg
Unknown:
Acceleration = ?
Solution:
To solve this problem, we use the expression derived from Newton's second law of motion.
Force = mass x acceleration
Insert the parameters and solve;
40 = 0.028 x acceleration
Acceleration = = 1428.6m/s²
Answer:
C. 69.0 kJ
Explanation:
Step 1: Given data
Mass of the horse (m): 500 kg
Distance traveled by the horse (d): 2000 m
Time elapsed (t): 120 s
Step 2: Calculate the speed of the horse (v)
The speed of the horse is equal to the distance traveled divided by the time elapsed.
v = d/t
v = 2000 m/120 s
v = 16.6 m/s
Step 3: Calculate the kinetic energy (K) of the horse
We will use the following expression.
K = 1/2 × m × v²
K = 1/2 × 500 kg × (16.6 m/s)²
K = 6.90 × 10⁴ J
Step 4: Convert "K" to kJ
We will use the conversion factor 1 kJ = 1000 J.
6.90 × 10⁴ J × (1 kJ/1000 J) = 69.0 kJ
The answer is B as all the other options contain quantities not related to describing motion
When a valence electron absorbs energy in the form of heat or light it uses that energy to jump to an excited state (outer level)