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3 years ago

A body having uniform velocity has zero acceleration? give reason

Physics

2 answers:

Gala2k [10]3 years ago

8 0

Explanation:

A body having uniform velocity has zero acceleration because its initial and final velocity are same

i.e,v=u

by the formula of acceleration,we have

v-u/t

=v-v/t

=0/t

Sonja [21]3 years ago

5 0

Answer:

A body having uniform velocity has zero acceleration because

there is not change in velocity.

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3 years ago

A spring of negligible mass has force constant of 1600 Newtons per meter. (a) How far must the spring be compressed for 3.20 Jou

frez [133]

Answer:

a) x=63.0 $x10^{-3} m$ or 6.3cm

b) x=116.0 $x10^{-3} m$ or 11.6cm

Explanation:

a).

The elastic potential energy is modeling by equation :

$U1=\frac{1}{2}*k*x^{2} \\K=1600 \frac{N}{m}\\ U=3.2J\\m=1.2kg\\x^{2}=\frac{2*U}{k}\\x=\sqrt{\frac{2*3.2J}{1600 \frac{N}{m}}} \\x=\sqrt{4x10^{-3} m^{2}}\\ x=0.06324m$

b).

The work energy theorem explain which work is done in this case. the motion began from the rest so K1=K2 equal zero, Ug1 is no yet done and U2is also zero because is the potential energy

$Ug=K2\\mgy=\frac{1}{2}*k*x^{2} \\but \\y=h+x=0.80m+x\\m*g*(0.80m+x)=\frac{1}{2}*k*x^{2}$

Solving for x

$2*(m*g(h+x))=k*x^{2} \\k*x^{2}-(2*m*g*x)-(2*m*g*h)=0\\1600x^{2} -2*1.2kg*9.8\frac{m}{s^{2}}*x-2*1.2kg*0.80m=0\\1600x^{2} -23.52x-18.816m=0$

$x=-\frac{b+/-\sqrt{b^{2}-4*a*c } }{2*a} \\x=-\frac{-23.52+/-\sqrt{-23.52^{2}-4*1600*-18.816 } }{2*a} \\x=11.79 +/- 173.9\\x1=-0.10 m\\x2=0.116$

The negative is discard so

x=0.116m

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3 years ago

Which of the following is most likely to be a warning that an advertisement

olga_2 [115]

Answer:

Explanation:

You would accept both A and D as being true. Both groups might be paid a small stipend for giving their testimonials but the amount would be to cover their time and travelling. They may not even be offered that.

You'd also accept C. Numbers, unless they are manipulated, generally don't lie.

B is the answer, but how would you know? How could you tell you were dealing with paid actors. However B is the answer.

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2 years ago

A body having uniform velocity has zero acceleration? give reason​

A body having uniform velocity has zero acceleration? give reason