Answer:im so sorry i cant find anything either ask your teacher for some help is the best thing i can do
It is A: They add energy to the work
Answer:
0 J
Explanation:
The weightlifter will have performed some work raising the mass to its current height, he is performing no work at all while holding it there.
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The mass is not moving through some distance, so the product of force and distance is zero.
Answer:
∆E = 4.16J
Change in internal energy of the tie and spike is 4.16J
Explanation:
Given;
Mass of spike m = 0.77kg
Initial Speed of spike v = 3.5m/s
Efficiency = 88.3%
Kinetic energy of spike can be calculated as;
K.E = 1/2 × mv^2
Substituting the values;
K.E = 1/2 × 0.77 × 3.5^2
K.E = 4.71625J
Change in internal energy of the tie and spike;
∆E = 88.3% of K.E
∆E = 0.883 × 4.71625J
∆E = 4.16J
Change in internal energy of the tie and spike is 4.16J
