Answer:
B
Explanation:
because it change heat with the surrounding
Answer:
F = 145 N
Explanation:
Given that,
Force applied by Jeff is 85 N and the force applied by Chris is 60 N. Both forces are acting in the same direction to push a rock up a hill. It means that net force is equal to the sum of these two forces.
So,
Net force on the rock = 85 N + 60 N
= 145 N
Hence, the net force on the rock is 145 N.
Answer:
The thyroid gland produces thyroxine (referred to as T4), which is a relatively inactive prohormone. The highly active hormone is triiodothyronine (referred to as T3).
Key actions of adrenaline include increasing the heart rate, increasing blood pressure, expanding the air passages of the lungs, enlarging the pupil in the eye (see photo), redistributing blood to the muscles and altering the body's metabolism, so as to maximise blood glucose levels (primarily for the brain).
Answer:
Work=1800 J
Speed=3m/s
Explanation:
Work is product of force and distance moved, expressed as
W=Fd
Where F is force and d is distance in meters
Substituting 300 N for force and 6 m for d then
W=300*6=1800 J
Kinetic energy is given by
KE=½mv²
Where m is the mass and v is velocity
Here, KE=W hence
W=½mv²
Making v the subject then
Substituting 1800J for W and 400 kg for m then
Therefore, velocity is 3 m/s