Answer:
A. The bobsled acceleration is 3.14 m/s²
Explanation:
Given:
Mass of the bobsled (m) = 132 kg
Force of push (F) = 450.0 N
Force of friction (f) = 35 N
Let the acceleration of the bobsled be 'a' m/s².
Now, as per Newton's second law, the net force acting on a body is equal to the product of mass and acceleration.
Net force acting on the bobsled is equal to the difference of applied force and friction and is given as:
Now, from Newton's second law,
Plug in all the values given and solve for 'a'. This gives,
Therefore, the acceleration is 3.14 m/s². So, option (A) is correct.
Answer:
Explanation:
The weight of some mass is defined as the product of mass by gravitational acceleration. In this way using the following formula we can find the weight.
where:
w = weight [N]
m = mass = 0.06 [kg]
g = gravity acceleration = 10 [N/kg]
Therefore:
By Hooke's law we know that the force in a spring can be calculated by means of the following expression.
where:
k = spring constant [N/m]
x = deformed distance = 6 [cm] = 0.06 [m]
We can find the spring constant.
Since we use the same spring on the moon and the same mass, the constant of the spring does not change, the same goes for the mass.
Since this force is equal to the weight, we can now determine the gravitational acceleration.
Answer:
mantle convection is the very slow creeping motion of earths solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface.