A block slides on a table pulled by a string attached to a hanging weight. In case 1 the block slides without friction and in ca
2 answers:
Answer:
In case 2
Explanation:
Thinking process:
The friction is a force that tends to oppose motion.
In case 1, the block slides without friction. This means that the surface is a smooth surface. Thus, the net force needed to pull the string is minimal.
In case 2, there is kinetic friction between the sliding block and the table. Now, the kinetic friction is given by the formula:
where, = coefficient of friction and N = normal force.
Thus, the net force needed:
Thus, the force is larger in case 2.
Therefore, the tension is larger in case 2.
You might be interested in
Answer:
Therefore the rate of corrosion 37.4 mpy and 0.952 mm/yr.
Explanation:
The corrosion rate is the rate of material remove.The formula for calculating CPR or corrosion penetration rate is
K= constant depends on the system of units used.
W= weight =485 g
D= density =7.9 g/cm³
A = exposed specimen area =100 in² =6.452 cm²
K=534 to give CPR in mpy
K=87.6 to give CPR in mm/yr
mpy
=37.4mpy
mm/yr
=0.952 mm/yr
Therefore the rate of corrosion 37.4 mpy and 0.952 mm/yr.
Answer:
23 mi
Explanation:
Let us first record all the values we have
acceleration = 4 ft/s
max speed = 90 mi/hr * 1 hr/3600s * 5280 ft/1 mi = 132 ft/s
We can use the equation of linear motion since acceleration is constant
distance covered = distance during acceleration + distance during costant
velocity
distance in miles = 120 978 ft * 1 mi/5280 ft = 22.9125 mi ≈ 23 mi