Answer:
The stones are apart one each the other 26.37 meters when the second one has reached a speed of 14 m/s.
Explanation:
<u>Second Stone:</u>
Vb= g*t
tb (14m/s)= Vb/g
tb (14m/s)= (14 m/s) / (9.8 m/s²)
tb (14m/s)= 1.42 sec
Hb= (g * tb²)/2
Hb= 9.88m
<u>First Stone:</u>
ta= tb + 1.3 sec
ta= 2.72 sec
Ha= (g*ta²)/2
Ha= 36.25m
Distance between Stones:
Ha-Hb= 36.25m - 9.88m
Ha-Hb= 26.37m
Answer:
Screaming is an emotional response triggered by the brain which receives information about the pain later as compared to pulling away of finger which is a reflex action facilitated by the spinal cord that has a quicker-time to response.
Explanation:
Reflex action happens when part of our body comes to contact with an object which can cause harm and you tend to quickly withdraw that part of the body.Reflex action happens quicker before the brain gets the time to process information about the harm.
When the baby touched the hot pan, at point of contact, skin receptors send nerve impulses to the spinal cord. Interneurons in the spinal cord relay a response to motor neurons to stimulate muscle contraction making the baby to pull his finger away.This happens so fast before the brain receives the message later to trigger emotional response(screaming).
Answer:
<em>Magnitude of the Frictional force is 200 N</em>
Explanation:
The frictional force is the force that tries to oppose relative motion between two surfaces that are contacting. The coefficient of static friction is the coefficient of friction of a body that is not moving.
Newton's third law of motion states that action and reaction forces are equal and opposite. So the frictional force felt on the filing cabinet will be equal to the applied force pulling the cabinet.
Frictional force = Force applied
Force applied = 200 N
Therefore, the magnitude of the friction force on the filing cabinet is 200 N
Answer:
22510.8J
Explanation:
Given parameters:
Mass of lead = 4.68kg
Initial temperature = 25°C
Final temperature = 62°C
Unknown:
The heat needed to cause this temperature change = ?
Solution:
To solve this problem, we use the expression below:
H = m c Ф
H is the quantity of heat
m is the mass
c is the specific heat capacity
Ф is the temperature change
So;
Specific heat capacity of lead = 130J/kg°C
Insert the parameters and solve;
H = 4.68 x 130 x (62 - 25) = 22510.8J
We can use the equation
to calculate the frequency.
Rearranging this gives us
.
So the frequency is
, which equals 0.42 hertz
(to 2 decimal places).
