 Lv 13 points

# sa

Questions30
• ### physics Q?

block 1 of mass m1 slides from rest along a frictionless ramp from height h and then collides with stationary block 2, which has mass m2 = 3m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction is μk and comes to a stop in distance d within that region. What is the value of distance d if the collision is (a) elastic and (b) completely inelastic? Express your answer in terms of the variables given and g.

(a) d =

(b) d =

• ### physics Q ?

A 0.23 kg puck is initially stationary on an ice surface with negligible friction. At time t = 0, a horizontal force begins to move the puck. The force is given by

F→=(13.8-2.55t2)î , with F→

in newtons and t in seconds, and it acts until its magnitude is zero. (a) What is the magnitude of the impulse on the puck from the force between t = 0.592 s and t = 1.46 s? (b) What is the change in momentum of the puck between t = 0 and the instant at which F = 0?

• ### physics Q?

(1), a 3.50 g bullet is fired horizontally at two blocks at rest on a frictionless table. The bullet passes through block 1 (mass 1.32 kg) and embeds itself in block 2 (mass 1.83 kg). The blocks end up with speeds v1 = 0.600 m/s and v2 = 1.44 m/s  (2)). Neglecting the material removed from block 1 by the bullet, find the speed of the bullet as it (a) leaves and (b) enters block 1.

• ### physics Q?

A force in the negative direction of an x axis is applied for 36 ms to a 0.79 kg ball initially moving at 19 m/s in the positive direction of the axis. The force varies in magnitude, and the impulse has magnitude 35.1 N s. (a) What is the ball's velocity (including sign for direction) just after the force is applied? (b) What is the average magnitude of the force on the ball?

• ### physics Q?

block 2 (mass 2.00 kg) is at rest on a frictionless surface and touching the end of an unstretched spring of spring constant 144 N/m. The other end of the spring is fixed to a wall. Block 1 (mass 1.90 kg), traveling at speed v1 = 5.80 m/s, collides with block 2, and the two blocks stick together. When the blocks momentarily stop, by what distance is the spring compressed?

Physics9 months ago
• ### physics Q?

block A (mass 1.4 kg) slides into block B (mass 2.8 kg), along a frictionless surface. The directions of velocities before and after the collision are indicated; the corresponding speeds are vAi = 5.4 m/s, vBi = 2.8 m/s, and vBf = 4.9 m/s. What is velocity vAf (including sign, where positive denotes motion to the right)?

• ### physics Q?

A steel ball of mass 0.340 kg is fastened to a cord that is 75.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal . At the bottom of its path, the ball strikes a 2.50 kg steel block initially at rest on a frictionless surface. The collision is elastic. Find (a) the speed of the ball and (b) the speed of the block, both just after the collision.

• ### physics q plz someone solve it plzzz important ?

A spring with spring constant k = 160 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 25 N is attached to the lower end, held still for a moment, and then released. What are (a) the kinetic energy K, (b) the change (from the initial value) in the gravitational potential energy ΔUg, and (c) the change in the elastic potential energy ΔUe of the spring–block system when the block is at y = –5.0 cm? What are (d)K, (e) ΔUg, and (f) ΔUe when y = –10 cm, (g)K, (h) ΔUg, and (i) ΔUe when y = –15 cm, and (j)K, (k) ΔUg, and (l) ΔUe when y = –20 cm?

• ### physics Q ?

A spring with spring constant k = 160 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 25 N is attached to the lower end, held still for a moment, and then released. What are (a) the kinetic energy K, (b) the change (from the initial value) in the gravitational potential energy ΔUg, and (c) the change in the elastic potential energy ΔUe of the spring–block system when the block is at y = –5.0 cm? What are (d)K, (e) ΔUg, and (f) ΔUe when y = –10 cm, (g)K, (h) ΔUg, and (i) ΔUe when y = –15 cm, and (j)K, (k) ΔUg, and (l) ΔUe when y = –20 cm?

• ### physics Q ?

A spring with spring constant k = 160 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 25 N is attached to the lower end, held still for a moment, and then released. What are (a) the kinetic energy K, (b) the change (from the initial value) in the gravitational potential energy ΔUg, and (c) the change in the elastic potential energy ΔUe of the spring–block system when the block is at y = –5.0 cm? What are (d)K, (e) ΔUg, and (f) ΔUe when y = –10 cm, (g)K, (h) ΔUg, and (i) ΔUe when y = –15 cm, and (j)K, (k) ΔUg, and (l) ΔUe when y = –20 cm?

• ### physics Q ?

a small block of mass m = 0.014 kg can slide along the frictionless loop-the-loop, with loop radius R = 20 cm. The block is released from rest at point P, at height h = 5R above the bottom of the loop. What are the magnitudes of (a) the horizontal component and (b) the vertical component of the net force acting on the block at point Q? (c) At what height h should the block be released from rest so that it is on the verge of losing contact with the track at the top of the loop? (On the verge of losing contact means that the normal force on the block from the track has just then become zero).

• ### math Q help?

A sheet of paper 90 cm-by-66 cm is made into an open box (i.e. there's no top), by cutting x-cm squares out of each corner and folding up the sides. Find the value of x that maximizes the volume of the box. Give your answer in the simplified radical form.

x =??  is the max.

• ### physics I need C only?

a small block of mass m = 0.014 kg can slide along the frictionless loop-the-loop, with loop radius R = 20 cm. The block is released from rest at point P, at height h = 5R above the bottom of the loop. What are the magnitudes of (a) the horizontal component and (b) the vertical component of the net force acting on the block at point Q? (c) At what height h should the block be released from rest so that it is on the verge of losing contact with the track at the top of the loop? (On the verge of losing contact means that the normal force on the block from the track has just then become zero).

Physics9 months ago
• ### physics q ?

A spring with spring constant k = 160 N/m is suspended vertically with its upper end fixed to the ceiling and its lower end at position y = 0. A block of weight 25 N is attached to the lower end, held still for a moment, and then released. What are (a) the kinetic energy K, (b) the change (from the initial value) in the gravitational potential energy ΔUg, and (c) the change in the elastic potential energy ΔUe of the spring–block system when the block is at y = –5.0 cm? What are (d)K, (e) ΔUg, and (f) ΔUe when y = –10 cm, (g)K, (h) ΔUg, and (i) ΔUe when y = –15 cm, and (j)K, (k) ΔUg, and (l) ΔUe when y = –20 cm?

Physics9 months ago
• ### physics q I need C ?

a small block of mass m = 0.014 kg can slide along the frictionless loop-the-loop, with loop radius R = 20 cm. The block is released from rest at point P, at height h = 5R above the bottom of the loop. What are the magnitudes of (a) the horizontal component and (b) the vertical component of the net force acting on the block at point Q? (c) At what height h should the block be released from rest so that it is on the verge of losing contact with the track at the top of the loop? (On the verge of losing contact means that the normal force on the block from the track has just then become zero).

Physics9 months ago
• ### math question ?

An advertisement consists of a rectangular printed region plus 5-cm margins on the sides and 6-cm margins at top and bottom. If the area of the printed region is to be 238 cm2, find the dimensions of the printed region that minimize the total area.

Printed region: l =  , w =

• ### physics q?

a small block of mass m = 0.014 kg can slide along the frictionless loop-the-loop, with loop radius R = 20 cm. The block is released from rest at point P, at height h = 5R above the bottom of the loop. What are the magnitudes of (a) the horizontal component and (b) the vertical component of the net force acting on the block at point Q? (c) At what height h should the block be released from rest so that it is on the verge of losing contact with the track at the top of the loop? (On the verge of losing contact means that the normal force on the block from the track has just then become zero).

• ### physics q?

A 2.4 kg breadbox on a frictionless incline of angle θ = 44 ˚ is connected, by a cord that runs over a pulley, to a light spring of spring constant k = 100 N/m, as shown in the figure. The box is released from rest when the spring is unstretched. Assume that the pulley is massless and frictionless. (a) What is the speed of the box when it has moved 10.9 cm down the incline? (b) How far down the incline from its point of release does the box slide before momentarily stopping, and what are the (c) magnitude and (d) direction of the box's acceleration at the instant the box momentarily stops?