3200m
80m/s * 40s = 3200m
seconds cancel out
- Let (X1, Y1) be one end point of the line segment that represents (1,2).
- Let (Xm, Ym) be the coordinates of the midpoint of the line segment which are given as (-1,4).
- Let (X2, Y2) be the other end point which has to be found out.
It then can be stated:
Since, Xm = -1 and X1 = 1 we can write equation (1) as
Since , Ym = 4 and Y1 = 2 we can write the equation (2) as
Therefore the other endpoint of the line (X2, Y2) is (-3 , 6)
Work is Force X Distance. The force is equal to mass X acceleration (F=MA). In this case the acceleration is gravity, which is 9.81 m/s^2. So you multiply 500 by 9.81 to get 4905 Newtons (N). This is the amount of force required to lift the safe. Multiply this force by the distance, which in this case is 90 meters. This gives you 441450 Newton Meters (N*m) of work. 1 N*m is equivalent to 1 Joule (J), so the answer can be written as 441450 Joules (J).
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Answer:
Explanation:
Work function of aluminium is 4.1 eV .
Therefor light of minimum energy of 4.1 eV will be required to cause the emission of electrons.
If we use this frequency of light or energy of light to effect ejection of photoelectrons from cesium , it will be easily ejected because energy requirement for this metal is lower ( work function is lower 2.1 eV ). than the energy of photon falling on it.
If we use this frequency of light or energy of light to effect ejection of photoelectrons from aluminium , it will be not ejected because energy requirement for this metal is high ( work function is higher 5.1 eV ) . Even if we increase the intensity of light , electrons will not be ejected because energy of each photon depends upon the frequency .