Answer:
Explanation:
a ) starting from rest , so u = o and initial kinetic energy = 0 .
Let mass of the skier = m
Kinetic energy gained = potential energy lost
= mgh = mg l sinθ
= m x 9.8 x 70 x sin 30
= 343 m
Total kinetic energy at the base = 343 m + 0 = 343 m .
b )
In this case initial kinetic energy = 1/2 m v²
= .5 x m x 2.5²
= 3.125 m
Total kinetic energy at the base
= 3.125 m + 343 m
= 346.125 m
c ) It is not surprising as energy gained due to gravitational force by the earth is enormous . So component of energy gained due to gravitational force far exceeds the initial kinetic energy . Still in a competitive event , the fractional initial kinetic energy may be the deciding factor .
The following are the answers:
1. B.<span>reduces pesticide residues.
> It reduces pesticide residues up to 50%. It also does not increase the amount of fat in beef because, corn, like wheat and grain, are high starch or high energy food, which would mean that, it reduces the time to fatten the cattle.
2. </span>B. Antimicrobial drugs should be limited to situations where the use of drugs is necessary for animal health.
> Improvement in management and animal health care have largely improved safety of food and as an outcome, decreased the need for antimicrobial in the system of food production.
3. A. 7
>A meta-analysis of 2012 identified that pesticide residues were found in 7% of organic produce samples, 38% conventional produce samples.<span>
4. </span><span>D. Raw shellfish from polluted water
> One way of getting Hepatitis A is eating contaminated food.
5. </span><span>B. Toxoplasma gondii
> Sources of infection of T.gondii is </span><span>contact with contaminated cat feces.
6. </span><span>Methyl mercury
7. </span><span>B. botulism infection.
> mainly caused by </span><span>botulinum toxin.
8. </span><span>D. E. coli
</span>
The impulse exerted by the ball on the bat is THE SAME
Answer:
55.897905
Explanation:
1 Newton in Earth gravity is the equivalent weight of 1/9.80665 kg on Earth
9.80665 times 5.7=55.897905
Brainliest?
Answer
Hi,
The forces are; weight (gravity), Normal/centripetal force and friction. Force due to gravity is constant where as friction and centripetal are not.
Explanation
Weight is constant, given by the force of gravity on the object. The centripetal force is a function of the angles occurring between the velocity vector and the weight vector that is at right angle with the perpendicular line drawn from the surface. Friction is a function of the centripetal force thus it also varies.
Hope this helps!