Answer:
6.2 seconds
Explanation:
Using Newton's second law, ∑F=ma, we know the net force acting on the object is Force applied-Force of friction. The net force is 203 N. Newton's second law requires the mass of an object, not the weight force, so we will have to calculate the mass. We know that m*g=weight force, in this case, solve for the mass and you will get 210 kg. Now that we have the value of the net force and the mass, we can solve for acceleration. =0.967 m/s^2. Now, since we have the acceleration, initial velocity(0 m/s), and the final velocity (6m/s) we will use these to solve for time using the kinematic equation Vf=Vi + at. Plug in the values we know and solve for time and you will get 6.2 seconds
Answer: A sealed calorimeter is a closed system because thermal energy is not transferred to the environment.
A closed system is an isolated system where there is no transfer of energy with its surroundings. Also the system is not subjected to any external force whose source is external to the system.
Answer:
A) Gravitational Force is greater in S.
B) Time taken to fall a given distance in air will be greater for F.
C) Both will take same time to fall in a vacuum.
D) Total force is greater in S.
Explanation:
(a) In this case, the gravitational force of S will be greater, because Newton's Second Law states that - F = ma, or weight =mg. g is constant. And mass of the solid metal is heavier.
(b) In this case, the time it will take for F to fall from a given distance in air will be greater than that of S, since the air resistance is not negligible (as in the case of S).
(c) In this, It will take same time for S and F because in a vacuum, there are no air particles, so there is no air resistance and gravity is the only force acting and so objects fall at the same rate in a vacuum.
(d) The total force will be greater in S than F because Force=ma and S is of heavier mass than F.
Answer:
(a) 1.64 rad/s²
(b) 39.94 rad
Explanation:
(a) From the question,
α = a/r................ Equation 1
Where a = linear acceleration if the motorcycle wheel, r = radius of the wheel, α = angular velocity of the wheel.
But,
a = (v-u)/t.............. Equation 2
Given: v = 1.4 m/s, u = 7.8 m/s, t = 5.8 s
Substitute into equation 2.
a = (1.4-7.8)/5.8
a = -1.1 m/s².
Note: The negative sign shows that the motorcycle is decelerating
Also given: r = 0.67 m.
Substitute into equation 1
α = 1.1/0.67
α = 1.64 rad/s²
(b)
Θ = s/r................... Equation 3
Where s = linear displacement, Θ = angular displacement.
But,
s = (v²-u²)/2a.......... Equation 2
s = (1.4²-7.8²)/[2×(-1.1)]
s = -58.88/-2.2
s = 26.76 m.
therefore,
Θ = 26.76/0.67
Θ = 39.94 rad.
Answer: 38 weeks (266 days) from the date of conception.
Explanation: www.momjunction.com/pregnancy-due-date-calculator/