# Thread: Need help with these questions, thanks

1. ## Need help with these questions, thanks

I am trying to figure this out and having problems solving it.

Q#1
Calculate the mass in grams for an object whose weight is 33.0 N
Total of mass in grams?

Q#2
Calculate the acceleration of an object whose mass is 5.26 tonne if an unbalanced force of 285 kN is pushing this object.

Q#3
a 30 kg block with an initial velocity of 10m/s due west slides 15m along a rough level floor and comes to rest. It takes 3 seconds to stop. The stopping force on the block is??

Q#4
A hockey puck is set in motion across a level frozen pond. If the frictional forces are neglected, the force required to keep the puck sliding at a constant velocity is
A> 0 newtons
B> equal to the weight of the puck
C> the weight of the puck divided by its mass
D> the mass of the puck multiplied by 9.81 m/s^2
E> none of the above.

PLEASE show all work so I can figure it out.

Jo

I am trying to figure this out and having problems solving it.

Q#1
Calculate the mass in grams for an object whose weight is 33.0 N
Total of mass in grams?

W = mg. You have W = 33N and g = 9.8m/sē. So you can easily calculate mass(m). But in this formula, mass is in kg. 1000g = 1kg. kilo is the prefix meaning 'a thousand'. Should be an easy conversion.

Q#2
Calculate the acceleration of an object whose mass is 5.26 tonne if an unbalanced force of 285 kN is pushing this object.

F = ma. First convert your data into standard SI units. F = 285 kN = 285 000 kN. m = 5.26 tonnes = 5260 kg.

Q#3
a 30 kg block with an initial velocity of 10m/s due west slides 15m along a rough level floor and comes to rest. It takes 3 seconds to stop. The stopping force on the block is??

Once again, F = ma.
You only have mass for now and need to find acceleration to calculate the force. Assuming acceleration (a) is constant, use the formula
d = Ut + 0.5atē where d = distance, U = initial velocity, and t = time taken.

Q#4
A hockey puck is set in motion across a level frozen pond. If the frictional forces are neglected, the force required to keep the puck sliding at a constant velocity is
A> 0 newtons
B> equal to the weight of the puck
C> the weight of the puck divided by its mass
D> the mass of the puck multiplied by 9.81 m/s^2
E> none of the above.

Newton's First Law of Motion (Intertia): In the absence of force, a body either is at rest or moves in a straight line with constant speed.