Answer: Friction stops things from sliding apart. If there was no friction everything would slide to the lowest point. With no friction the only possible movement would be falling to a lower point under gravity.
Explanation: In a frictionless world, more objects would be sliding about, clothes and shoes would be difficult to keep on and it would be very difficult for people or cars to get moving or change direction. Students should be encouraged to consider how dependant their world is on the beneficial action of friction. Humans and other objects will become weightless without gravity. If we have no gravity force, the atmosphere would disappear into space, the moon would collide with the earth, the earth would stop rotating, we would all feel weightless, the earth would collide with the sun, and as a consequence.
Answer:The star with a wavelength of approximately 500 nm does not emit light in the red part of the spectrum.
Explanation:
Answer: 3.99g
Explanation:
Specific heat capacity (c) is defined as the quantity of heat required to raise the temperature of an object/ a body by 1kelvin.
Mathematically, Q = mc∆t where;
Q is the quantity of heat absorbed
m is the mass of the object
c is the specific heat capacity
∆t is the change in temperature = final temperature - initial temperature.
Given Q = 900Joules, c =0.902J/gK ∆t = 38°C - 30°C = 8°C = 8°C+273 = 281Kelvin
m is the unknown
Substituting this values in the given formula to get m we have;
m = Q/c∆t
m = 900/0.802(281)
m = 900/225.362
m = 3.99g
Mass of aluminum used is 3.99g
