Onur is floating freely in outer space with a propulsion thruster to help him counteract the pull of gravity. The gravitational
forces pulling on his body are negligible except for those from the nearest planet (described by force vector \purple{\vec p}\, p start color #9d38bd, p, with, vector, on top, end color #9d38bd) and the nearest star (described by force vector \blue{\vec s}\, s start color #6495ed, s, with, vector, on top, end color #6495ed). Onur, the planet, and the star are in the same plane, so we can describe the gravitational forces as two-dimensional vectors. \purple{\vec{p}} = (4,6) p =(4,6)start color #9d38bd, p, with, vector, on top, end color #9d38bd, equals, left parenthesis, 4, comma, 6, right parenthesis \blue{\vec{s}} = (1,7) s =(1,7)start color #6495ed, s, with, vector, on top, end color #6495ed, equals, left parenthesis, 1, comma, 7, right parenthesis (Forces are given in newtons, \text{N}Nstart text, N, end text.)
1 answer:
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Answer:
d) 1/4 F
Explanation:
The magnitude of electrostatic force between stationary charges is described by Coulomb's law. This law states that this force is proportional to the magnitudes of the charges:
When each of the spheres has lost half its initial charge, we have:
So, the new electrostatic force is:
Answer:
0.6 m/s
Explanation:
Let the raft speed be v.
Given:
Mass of the swimmer (m) = 75 kg
Mass of the raft (M) = 500 kg
Speed of swimmer after leaving the raft (u) = 4 m/s
Now, the given situation can be considered a problem of conservation of total momentum before and after collision.
Momentum is the product of mass and velocity.
Here, the swimmer and raft are the bodies in collision.
So, before the collision, both the bodies were at rest. So, initial momentum is 0. Now, from conservation of momentum, the final momentum of the system must be 0 after the collision. Therefore,
Final Momentum = 0
Plug in the given values and solve for 'v'. This gives,
The final velocity of the raft is -0.6 m/s. Now, speed is the magnitude of velocity.
Therefore, the corresponding raft speed is 0.6 m/s.
Answer:
energy = 391.902 kJ /mol
Explanation:
given data
wavelength = 305 nm = 305 × m
to find out
average energy
solution
we know speed of light is 3 × m/s
so we find frequency here first by speed of light formyla
speed = wavelength × frequency
3 × = 305 ×
× frequency
frequency = 9.8360 ×
so energy is
energy = hf
here h = 6.62 × J-s
so
energy = 6.62 × × 9.8360 ×
energy = 6.51 × J
so
energy = 6.51 × ×
kJ/mol
energy = 391.902 kJ /mol