Answer:
Assume that the ball undergoes motion along a straight line. ... F = m A Force = (mass) x (acceleration) The question tells you the mass and the acceleration. All YOU have to do is take the numbers and pluggum into Newton's 2nd law. F = m A = (0.75 kg) (25 m/s²) = (0.75 x 25) kg-m/s² = 18.75 Newtons .
Explanation:
i looked it up ok
Explanation:
initial velocity 0, final velocity 8.00,time taken 2×60= 120+50=170,now using formula a=v_u\t=8.00-0/170=8.00/170=
Answer:
D
Explanation:
Kinetic energy = 1/2mV^2
From the formula above, we can deduce that kinetic energy is proportional to the square of speed. That is,
K.E = V^2
Graphically, the relationship isn't linear but a positive exponential. Therefore, option D is the correct answer.
Answer:
Np=130 turns, Is=220 A
Explanation:
Part A:
Ns=100 turns
Vp= 1.5*104 V = 156 V
Vs= 120 V
As Np/Ns= Vp/Vs
⇒ Np=
⇒Np=
Np= 130 turns (It has two significant figures)
Part B
Is=280 A, Vs=120 V, Vp= 1.5*104 V= 156 V
For ideal transformer
Pin=Pout
Ip*Vp= Is*Vs
⇒Ip=()
⇒Ip=
⇒Ip=215.4 A
to represent it as two significant figures we will write as
⇒Ip=220 A
The Formula we use to work out this question is:
Q=m*c*ΔT
Where,
- Q= Thermal Energy (J)
- m= Mass of object (kg)
- c= Specific heat capacity (J/kg^C)
- ΔT = Change in Temperature. (°C)
Firstly we want to substitute the values in: (Note, ΔT is Negative as we are lowering the temperature)
Q=0.25kg * 2020J/kg^ C * (-7°C)
This gives us:
Q= -3535 J.
This means that 3535J of thermal energy must be removed from the block of ice in order to lower its temperature by 7°C.