A 100.0 g mass falls off the table in the physics lab. You measure the table to be 94.0 cm high. How much work W, in units of joules ( 1 J = 1 kg⋅m2/s2 ) does gravity do on the mass asitfalls?Theworkdonebygravityis W =F d mgd=where g=9.81m/s2 and d isthe G vertical distance the mass falls.

A mechanic pushes a 3770 kg car from restto a speed of v, doing 4845 J of work in theprocess.Find the speed v. Neglect friction betweencar and road.Answer in units of m/s.

A 1080 kg car accelerates at a rate of 2.1 m/s/s over a distance of 18 meters. How much work was done by the engine onthe car? HINT: Use the formula F=ma to solve for the force. Then use the force and distance to calculate the work

9. AV R 6121W Higgins A.Nouvel onglet R 2634 W catalpa.. Physics 235-Spring 2023 Chapter 7 Worksheet The cable of a crane is lifting a 750 kg girder. The girder increases its speed from 0.25 m/s to 0.75 m/s in a distance of 3.5 m. a. How much work is done by gravity? b. How much work is done by tension?

Sam, whose mass is 75 kg , straps on his skis and starts down a 50 mm -high, 20∘frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Use work and energy to find Sam's speed at the bottom.

The Force reaquired to compress a non-standard spring as a qunetion. Syod Adispiacement From equilibrium X 1S given by the equation B9 F(X)=Da2-bx, where a= 35 NI ª, b=1aN/m, andh the pasitivex dırectión is inthe comprersiun directon o7 the spring Part c: Cal culate the work dune ,injoules, onthe spring as t is compressed 7rom xj =52 cm toxg=810cm. WIza=D?

A 17 g bullet is accelerated in a rifle barrel81.5 cm long to a speed of 846 m/s.Use the work-energy theorem to find theaverage force exerted on the bullet while it isbeing accelerated.Answer in units of N.

15. A particle is subject to a force F, that varies with posi- W tion as shown in Figure P7.15. Find the work done by the force on the particle as it moves (a) from x = 0 to 5.00 m, (b) from x = 5.00 m to x = 10.0 m, and (c) from x= 10.0 m to x = 15.0 m. (d) What is the total work done by the force over the distance x = 0 to x = 15.0 m? x= F, (N) 3 2 1 0 x (m) 2 4 6 8 10 12 14 16 Figure P7.15 Problems 15 and 34.

Wfric Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 100.0 kg down a 60° slope at constant speed, as shown in the figure. The coefficient of friction between the sled and the snow is 0.100. = (a) How much work is done by friction as the sled moves 30.0 m along the hill. Enter to 3 significant figures Wrope 1.47 × 10³ J = W grav 60° (b) How much work is done by the rope on the sled in this distance? Hint: use Newton's second law to find the tension. Enter to 3 significant figures W -2.39x104 T = 2.55×104 J (c) What is the work done by the gravitational force on the sled? Enter to 3 significant figures

A child pulls a box of toys using a steady force of 10. N at an angle 60o from the horizontal. How much work is done by the child after the box moves with a distance of 4.0 m horizontally?