2. Calculate the work done by a 57 N force pushing a 0.025 kg pencil 0.25 m against a force of 23 N.
1 answer:
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Answer:
a)3.5s
b)28.57m/S
c)34.33m/S
d)44.66m/S
Explanation:
Hello!
we will solve this exercise numeral by numeral
a) to find the time the ball takes in the air we must consider that vertically the ball experiences a movement with constant acceleration whose value is gravity (9.81m / S ^ 2), that the initial vertical velocity is zero, we use the following equation for a body that moves with constant acceleration
where
Vo = Initial speed =0
T = time
g=gravity=9.81m/s^2
y = height=60m
solving for time
T=3.5s
b)The horizontal speed remains constant since there is no horizontal acceleration. with the value of the distance traveled (100m) and the time that lasts in the air (3.5s) we estimate the horizontal speed
c)
to find the final vertical velocity we use the equations for motion with constant velocity as follows
Vf=Vo+g.t
Vf=0+(9.81 )(3.5)=34.335m/S
d)Finally, to find the resulting velocity, we add the horizontal and vertical velocities vectorially, this is achieved by finding the square root of the sum of its squares
We have that heat flow out of the copper sample is mathematically given as
Q=8.86809J
<h3> Heat flow</h3>Question Parameters
- A temperature of a 0.349 kg sample of copper
- decreases from 87.0 °C to 21.0 °C.
Endothermic Reaction
It is common knowledge that an endothermic reaction is one where the system absorbs heat energy from the <em>environs</em>.
Exothermic Reaction
An exothermic reaction is one where the system releases heat energy to the <em>environs</em>.
Generally the equation for Heat is mathematically given as
Q=8.86809J
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