1) we have a ball with mass m=1Kg ,and one force acts on this ball and reduces its velocity from 4m/s to 2m/s in time 1s ,what is the value of this force?
A. - 1N
B.- 2N
C. 1N
D. 3N
2) A force acts on abject with mass m =3Kg ,then gives it an acceleration of $1 m/s^{2}$,find the value of acceleration for same force if the mass of object is 2Kg ?
A. $1 m/s^{2}$
B. $1.5 m/s^{2}$
C. $3 m/s^{2}$
D. $6 m/s^{2}$
3)we have a volume of gas $ V=10m^ 3$ at pressure 100 KPa and temperature 10 C,find new volume of this gas if we change the pressure to 200 KPa and temperature to 50 C?
A. $20 m^ 3$
B. $21 m^ 3$
C. $25 m^ 3$
D. $30 m^ 3$
4)How much heat is required to raise temperature of 500 mL of water from 50 C to 100 C ?
A. 10 Kcal
B. 20 Kcal
C. 25 Kcal
D. 50 Kcal
5) A object moves along the X axis according to the law :
$ x= t^{3}+3t^{2}+2$
find acceleration at t=3s ?
A. $6 m/s^{2}$
B.$12 m/s^{2}$
C.$18 m/s^{2}$
D.$24 m/s^{2}$
6) A object moves along the X axis according to the law :
$ x= 5t^{2}+2t+7$
find velocity at time t= 10 s ?
A.102 m/s
B.120 m/s
C.170 m/s
D.190 m/s
7)A charge of 10 C and mass $m=10^{-27}kg$ moves with velocity v=5 m/s in a magnetic field of 0.5 T
the angle between velocity vector and magnetic field vector is $\pi/2$ .
find the radius of the circle of the charged particle's orbit?
A.$10^{-26}m$
B.$10^{-27}m$
C.$2.10^{-27}m$
D.$5.10^{-26}m$
Answer key :
1.B
2.B
3.C
4.C
5.D
6.A
7.B
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