Questions from Modern Physics

Q: A luggage handler pulls a 20.0-kg suitcase up

A luggage handler pulls a 20.0-kg suitcase up a ramp inclined at 32.0° above the horizontal by a force

Q: While doing a chin-up, a man lifts his body

While doing a chin-up, a man lifts his body 0.40 m. (a) How much work must the man do per kilogram of body mass? (b) The muscles involved in doing a chin-up can generate about 70 J of work per kilogra...

Q: Consider the blocks in Exercise 6.7 as they move 75

Consider the blocks in Exercise 6.7 as they move 75.0 cm. Find the total work done on each one (a) if there is no friction between the table and the 20.0-N block, and (b) if

Q: A 5.00-kg package slides 2.80 m

A 5.00-kg package slides 2.80 m down a long ramp that is inclined at 24.0° below the horizontal. The coefficient of kinetic friction between the package and the ramp is mk = 0.310. Calculate (a) the w...

Q: When a car is hit from behind, its passengers undergo sudden

When a car is hit from behind, its passengers undergo sudden forward acceleration, which can cause a severe neck injury known as whiplash. During normal acceleration, the neck muscles play a large rol...

Q: A net force along the x-axis that has x-

A net force along the x-axis that has x-component Fx = -12.0 N + (0.300 N/m2)x2 is applied to a 5.00-kg object that is initially at the origin and moving in the -x-direction with a speed of 6.00 m/s....

Q: When a car is hit from behind, the occupants may experience

When a car is hit from behind, the occupants may experience whiplash. Use Newton’s laws of motion to explain what causes this result.

Q: A box is sliding with a speed of 4.50 m

A box is sliding with a speed of 4.50 m/s on a horizontal surface when, at point P, it encounters a rough section. The coefficient of friction there is not constant; it starts at 0.100 at P and increa...

Q: Consider a spring that does not obey Hooke’s law very faithfully.

Consider a spring that does not obey Hooke’s law very faithfully. One end of the spring is fixed. To keep the spring stretched or compressed an amount x, a force along the x-axis with x-component Fx =...

Q: A small block with a mass of 0.0600 kg is

A small block with a mass of 0.0600 kg is attached to a cord passing through a hole in a frictionless, horizontal surface (Fig. P6.71). The block is originally revolving at a distance of 0.40 m from t...