phys1

Which of the following is a vector quantity?

• Temperature

• energy

• speed

• momentum

A motorcycle accelerates eastward from rest to a speed of 14 m/s for a distance of 30 m. What is the acceleration of the motorcycle?

• 6.53 m/s²

• 0.233 m/s²

• 3.26 m/s²

• 3.75 m/s²

 $A\ car\ is\ moving\ at\ x\left(t\right)\ =\ \left(\ 6t^3\ +\ 8t\ -\ 4\ \right)\$  What is the location of the car after 3 seconds ?

• 170 m

• 182 m 

• 99 m 

• 108 m

The position of a particle moving along the x- axis is given by  $x\left(t\right)\ =\ \left(8t^2-3t\ +\ 5\right)m\$  with time t in seconds and position x in meters . 

• 0 m/s

• 6 m/s 

• 8 m/s 

• 11 m/s 

• A

• B

• C

• D

The acceleration due to gravity on the moon is only one-sixth that of Earth’s. Which of the following is TRUE about the motion of a body on the moon?

• The acceleration of a rock thrown upward on the moon is zero as the rock reaches maximum height.

• The velocity of an apple as it hits moon’s surface is greater compared to Earth.

• After one second a freely falling bag on the moon gains a speed of 1.63 m/s.

• Any object on the moon will hit its surface at a speed of 1.6 m/s.

In free fall , what is the vertical velocity when it reaches the maximum height?

• 8.45 m/s

• 9.8 m/s

• -9.8 m/s

• 0 m/s

A brick is dropped from rest from a height of 6.3 m. How long does it take the brick to reach the ground?

• 9.8 s

• 1.56 s

• 1.13 s

• 1.0 s

When ball having a projectile motion is going down, it

• accelerates

• decelarates

• rise up at constant acceleration

• acceleration becomes zero

A 0.12-m-radius grinding wheel takes 5.5 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?

• 9.6 rad/s²

• 4.3 rad/s²

• 1.6 rad/s²

• 6.2 rad/s²