i want the answers od these questions till SUNUDAY plz help - Physics - Laws Of Motion

Question

i want the answers od these questions till SUNUDAY plz help
QUESTIONS
1 when is the sum of two vectors
a maximum
b minimum
2 what physical quantity does the area under the force
-displacement curve represent ?
3 statci friction is a self adjusting friction ?explain?
4 is it necessary that work done in the motion of a body over a
closed loop is zero for every force in nature ?
5 the v-t graph of 2 objects makes a 30 and 60 degree angles
with time axis find the ratio of their accelations
6 how does the kinetic energy of the body changes if its
momentum is doubled?
7 a horizontal force of 600N pulls 2 masses 10 and 20 kg lying
on a frictionless table and connectd by light string wht is the
tension in the string?
8 a car of mass m1 and truck of mass m2 (m2>m1) are moving
with same velocity V show that which of them have greater
momentum
9 wht r conditions for equality if 2 vectors?
10 explain the applications of dimensional annalysis
11 a car is travelling on a straight level road with a speed of
60km/h it is followed by another car b which is moving with speed
of 70km/h whn the distance is 2 5km,the car B is given a
deacceleration of 20km/h after how much time and wht distance will
the car b catch up car a?
12 a projectile is thrown at an angle theeta from the horizontal
with velocity U under the gravitational field of the earth finid
its range
13 for what value of the angle b/w 2 equal vectors the magnitude
of th resultant vectors may be equal to each of them?
14 according principle if conservation of linear momentum , vl
the momentum remain conserved , if some external force acts on the
system ?
15 mention 4 properties of conservative forces
16 define instantaneous power express it as the scalar product
of 2 vectors

Mallesh Koram · Accepted Answer

Dear Student,

Ask questions individually We cannot answer too many question in
single post
Please find below the solution to the asked query:
1)

The vector sum is given according to the parallelogram law of
vector sum,

R=A2+B2+2AB cos θ
Where θ is the angle between two vectors

The maximum possible value for sum is for angle
θâ€‹ = 00,

R=A2+B2+2AB=A+B

The minimum possible value for sum is for angle θ =
1800,

R=A2+B2-2AB=A-B
2)

Area under the Force - displacement curve gives the energy
(work done)

W=Area Under Curve=∫F dx
Hope this information will clear your doubts about the topic
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