Section 1
Work
Given:$F=10.0 \mathrm{~N}$$s=3.43 \mathrm{~m}$$W=?$
Given: $F=125 \mathrm{~N}$$s=4875 \mathrm{~m}$$W=?$
Given:$F=1850 \mathrm{~N}$$s=625 \mathrm{~m}$$\theta=37.5^{\circ}$$W=?$
$\begin{aligned} \text { Given: } W &=697 \mathrm{ft} \mathrm{lb} \\ s &=976 \mathrm{ft} \\ F &=? \end{aligned}$
Given: $\begin{aligned} F &=25,700 \mathrm{~N} \\ s &=238 \mathrm{~m} \\ W &=5.57 \times 10^{6} \mathrm{~J} \\ \theta &=? \end{aligned}$
Given:$F=m a$$\begin{aligned} m &=16.0 \mathrm{~kg} \\ a &=9.80 \mathrm{~m} / \mathrm{s}^{2} \\ s &=13.0 \mathrm{~m} \\ W &=? \end{aligned}$
How much work is required for a mechanical hoist to lift a $90 \overline{0} 0-\mathrm{N}$ automobile to a height of $1.80 \mathrm{~m}$ for repairs?
A hay wagon is used to move bales from the field to the barn. The tractor pulling the wagon exerts a constant force of 350 lb. The distance from field to barn is $\frac{1}{2}$ mi. How much work (ft lb) is done in moving one load of hay to the barn?
A worker lifts 75 concrete blocks a distance of $1.50 \mathrm{~m}$ to the bed of a truck. Each block has a mass of $4.00 \mathrm{~kg}$. How much work is done to lift all the blocks to the truck bed?
The work required to lift eleven 94.0 -lb bags of cement from the ground to the back of a truck is $4340 \mathrm{ft}$ lb. What is the distance from the ground to the bed of the truck?
How much work is done in lifting $450 \mathrm{lb}$ of cement $75 \mathrm{ft}$ above the ground?
How much work is done lifting a $20 \overline{0}-\mathrm{kg}$ wrecking ball $6.50 \mathrm{~m}$ above the ground?
A gardener pushes a mower a distance of $900 \mathrm{~m}$ in mowing a yard. The handle of the mower makes an angle of $40.0^{\circ}$ with the ground. The gardener exerts a force of $35.0 \mathrm{~N}$ along the handle of the mower (Fig. 8.8). How much work does the gardener do in mowing the lawn?
A traveler is pulling a suitcase at an angle of $40.0^{\circ}$ with the horizontal (Fig. 8.9). If she exerts a force of 5.00 lb along the handle, how much work does the traveler do in pulling the suitcase $\frac{1}{4}$ mi?
A crate is pulled $675 \mathrm{ft}$ across a warehouse floor by a worker using a rope that makes an angle of $50.0^{\circ}$ with the floor. If $375 \mathrm{lb}$ is exerted on the rope, how much work is done in pulling the crate across the floor?
A man pulls a sled a distance of $231 \mathrm{~m}$. The rope attached to the sled makes an angle of $30.0^{\circ}$ with the ground. The man exerts a force of $775 \mathrm{~N}$ on the rope. How much work does the man do in pulling the sled?
A tractor tows a barge through a canal with a towrope that makes an angle of $21^{\circ}$ with the bank of the canal. If the tension in the rope is $12,000 \mathrm{~N}$, how much
Two tractors tow a barge through a canal; each tractor uses a towrope that makes an angle of $21^{\circ}$ with the bank of the canal. If the tension in each rope is $12,000 \mathrm{~N},$ how much work is done in moving the barge $550 \mathrm{~m} ?$
Two students push a dune buggy $35.0 \mathrm{~m}$ across a lot. The force required is $825 \mathrm{~N}$. How much work is done?
After a rain, the force necessary to push the dune buggy in Problem 19 through the mud is doubled. How does the amount of work done by the students change?
A delivery person carries a $215-\mathrm{N}$ box up stairs $4.20 \mathrm{~m}$ vertically and $6.80 \mathrm{~m}$ horizontally.(a) How much work does the delivery person do? (b) How much work does the delivery person do in carrying the box down the stairs?
A crate is pulled by a force of $628 \mathrm{~N}$ across the floor by a worker using a rope making an angle of $46.0^{\circ}$ with the floor. If the crate is pulled $15.0 \mathrm{~m}$, how much work does the force on the rope do?
A laborer pushes a wheelbarrow weighing $20 \overline{0} \mathrm{~N}$ at $25.0^{\circ}$ above the horizontal. If he pushes it a distance of $25.0 \mathrm{~m}$, how much work is done?
An end loader lifts a $10 \overline{0} 0-\mathrm{N}$ bucket of gravel $1.75 \mathrm{~m}$ above the ground. How much work is done?