In the diagram below, a cart travels clockwise at constant speed in a horizontal circle.

At the position shown in the diagram, which arrow indicates the direction of the centripetal acceleration of the cart?

1) A.

2) B.

3) C.

4) D.

Una persona compie un viaggio guidando a una velocità costante di 89,5 km/h, fatta eccezione per una sosta di 22,0 minuti. Se la velocità media della persona è di 77,8 km/h,

(a) quanto tempo è durato il viaggio e

(b) quanto distanza ha percorso la persona?

A 65.0 kg ice skater moving to the right with a velocity of 2.5 m/s throws a 0.15 kg snowball to the right with a velocity of 32.0 m/s relative to the ground.

a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and the ice.

b) A second skater initially at rest with a mass of 60.0 kg catches the snowball. What is the velocity of the second skater after catching the snowball in a perfectly inelastic collision?

A water slide is constructed so that swimmers starting from rest, at the top of the slide, leave the end of the slide traveling horizontally. As the drawing shows, one person hits the water 5.00 m from the end of the slide in a time of 0.554 s after leaving the slide. Ignore friction and air resistance, find the height H in the drawing.

A water skier has a mass of 73 kg. Find the magnitude of the net force acting on the skier when she is accelerated from rest to a speed of 11 m/s in 8 s.

A glass bottle of soda is sealed with a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.80 x 10^5 Pa. Assuming that the top and bottom surfaces of the cap each have an area of 4.10 x 10-4 m^2, obtain the magnitude of the force that the screw thread exerts on the cap in order to keep it on the bottle. The air pressure outside the bottle is one atmosphere.

You drop a ball from rest out a window 12 m above the ground and just before it hits the ground its speed is recorded to be 15.0 m/s. What percentage of the ball's mechanical energy was dissipated due to air resistance as it fell?

Un libro di fisica scivola da un tavolo orizzontale con una velocità di 1,10 m/s. Colpisce il pavimento in 0,480 s. Ignora la resistenza dell'aria. Trova:

(a) l'altezza del piano del tavolo sopra il pavimento;

(b) la distanza orizzontale dal bordo del tavolo al punto in cui il libro colpisce il pavimento;

(c) le componenti orizzontale e verticale della velocità del libro, e la misura e la direzione della sua velocità, appena prima che il libro raggiunga il pavimento.

(d) Disegna i grafici $x$ - $t$, $y - t$, $v _ { x } - t$ e $v _ { y } - t$ per il movimento.

A man weighs 442 N on Earth. What would he weigh on Jupiter where the free fall acceleration is 25.9 m/s^2? The acceleration of gravity on Earth is 9.8 m/s^2. Answer in the unit of N.

A ball with a mass of 0.500 kg is moving at 20 m/s. The uncertainty in momentum is 1 10^-10 kg m/s of its momentum. Determine the uncertainty in position in m.

Una canoa ha una velocità di 0,40 m/s sud-est rispetto alla terraferma. La canoa si trova su un fiume che scorre a 0,50 m/s a est rispetto alla terraferma. Trova la velocità (magnitudo e direzione) della canoa rispetto al fiume.

A Football player kicks a ball at an angle of 30° to the horizontal with an initial velocity of 15 m/s. Assuming the ball travels in a vertical plane, Calculate the

a) Maximum height.

b) Time of flight.

c) Horizontal range.

[g=9.8 m/s^2]

Un camion percorre 40,0 m in 8,50 s mentre rallenta dolcemente fino alla velocità finale di 2,80 m/s.

a.) Trova la sua velocità originale.

b.) Trova la sua accelerazione.

What is the angular momentum about the axle of the 2.0-kg 4.0-cm diameter rotating disk in the figure below?

A rigid body rotates about a fixed axis with a constant angular acceleration. Which one of the following statements is true concerning the tangential acceleration of any point of the body?

A) The tangential acceleration is zero m/s².

B) The tangential acceleration depends on the angular velocity.

C) The tangential acceleration is equal to the centripetal acceleration.

D) The tangential acceleration is constant in both magnitude and direction.

E) The tangential acceleration depends on the change in the angular velocity.