when we throw an arrow , we first stretch the string of the bow. while stretching the string of the bow, the work done by us in stretching the bowstring gets stored as potential energy in the bow. This potential energy of the bow is transformed into kinetic energy when the bowstring is released and this gives the momentum and Kinetic energy to the arrow.
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Answer:
57.5022228905 s
Explanation:
= Initial voltage
= Final voltage = 0.401 V
= Initial time = 8.36 s
= Final time
K = Kinetic Energy = 
C = Charge = 
Voltage is given by
We have the relation
The time taken is 57.5022228905 s
Answer:
A. 20 N
Explanation:
Weight of the book = mass × acceleration due to gravity
= 2 × 10
= 20 N
Answer:
Earth because of greater gravity
Answer:
2. + 2.1
Explanation:
Formula for resistance is as follows
R_t = R₀ ( 1 + α t )
R_t is resistance at changed temperature , Ro is resistance at initial temperature , α is temperature coefficient of resistivity . t is temperature change .
For iron , R₀ = 10 , α = 5 x 10⁻³ , t = - 100 degree
R_t = 10( 1 + 5 x 10⁻³ x - 100 )
= 10( 1 - 5 x 10⁻³ x 100 )
10 x ( 1 - .5 )
10 x .5
For carbon
, R₀ = 10 , α = - 0.5 x 10⁻³ , t = - 100 degree
R_t = 10( 1 - 0. 5 x 10⁻³ x - 100 )
= 10( 1 + .5 x 10⁻³ x 100 )
10 x ( 1 + .05 )
10 x 1.05
Required ratio
= 10 x 1.05 / 10 x .5
= 105 / 50
= 21 / 10
= 2.1
