A projectile of mass 0.50 kg is fixed with an initial speed of 10 m/s at an angl

Question

A projectile of mass 0.50 kg is fixed with an initial speed of 10 m/s at an angle of 60 above the horizontal. The kinetic energy of the projectile at its highest point(relative to the ground level)is: 25J 18.75 J 12.5 J 6.25 J none of the above A 40-N crate rests on a rough horizontal floor. A 10-N horizontal forces is then applied to it. If the coefficients of friction are mu_a = 0.5 and mu = 0.4, the magnitude of the frictional force on the crate is: 10 N 12 N 15 N 20 N 40 N A 0.25-kg ball attached to a string is rotating in a horizontal circle of radius 1.0 m. If the ball makes one revolution per second, the centripetal force provided by the string is close to: 2 N 5 N 7 N 10 N 20 N Which force is responsible for holding a car in an unbanked curve? the car's weight the force of friction the reaction force to the car's weight the vertical component of the normal force the horizontal component of the normal force The maximum speed at which a car can safely negotiate a frictionless banked curve depends on the horizontal component of the normal force: True False A 0.50-kg attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. The total mechanical energy needed to compress the spring by 5.5 cm is 0.12 J. The greatest extension of the spring from its equilibrium length is: 0.12 J 1.20 J 2.1 J 0.2 J Two objects, m_1 = 1.0 kg and m_2 = 10 kg are released from rest 10 m above the ground at the same time. They will hit the ground with the: same kinetic energy same momentum different velocities same velocity

Explanation / Answer

1) D) 6.25 J

at highest point, KE = (1/2)*m*vx^2

= (1/2)*0.5*(10*cos(60))^2

= 6.25 J

2) A) 10 N

3) D) 10 N

F = m*a_rad

= m*r*w^2

= m*r*(2*pi/T)^2

= 0.25*1*(2*pi/1)^2

= 10 N

4) B

5) True

6) Question does not make any sense.

7) D) same velocity

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