Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 23

**physics**

A mass attached to a spring oscillates with a period of 3.04 s. If the mass starts from rest at x = 0.0420 m and time t = 0, where is it at time t = 2.75 s?

**Chemistry**

Under acidic conditions, MnO4− becomes Mn2+. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)

**physics**

A uniform thin rod of length 0.55 m and mass 5.5 kg can rotate in a horizontal plane about a vertical axis through its center. The rod is a rest when a 3.0-g bullet traveling in the horizontal plane of the rod is fired into one end of the rod. As viewed from above, the directi...

**physics**

What linear speed must a 0.0508-kg hula hoop have if its total kinetic energy is to be 0.164 J? Assume the hoop rolls on the ground without slipping.

**physics**

A wheel, starting from rest, has a constant angular acceleration of 1.8 rad/s^2. In a 3.1-s interval, it turns through an angle of 142 rad. How long has the wheel been in motion at the start of this 3.1-s interval?

**physics**

A 41.0-kg body is moving in the direction of the positive x axis with a speed of 306 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.0 kg, moves away from the point of explosion with a speed of 326 m/s along the positive y axis....

**physics**

Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...

**Physics**

A)A block rests on a horizontal frictionless surface. A string is attached to the block, and is pulled with a force of 60.0 N at an angle θ above the horizontal. After the block is pulled through a distance of 2.00 m, its speed is 2.70 m/s, and 43.0 J of work has been don...

**physics**

A set of crash tests consists of running a test car moving at a speed of 11.6 m/s (25.52 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 61 kg (134.2 lbs) dummy is found to move a distance of 0.69 m from the moment the car touches the wall to the t...

**Damon**

Part A keeps be marked wrong. Is my answer supposed to be 493.7 N ?

**physics**

A)A 90 kg crate is pushed at constant speed up the frictionless 34° ramp shown in the figure. What horizontal force F is required? B)What force is exerted by the ramp on the crate?

**physics**

A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?

**physics**

A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing is 26.0 m/s and points...

**physics**

A projectile is launched from ground level at 37.0 m/s at an angle of 30.6 ° above horizontal. Use the launch point as the origin of your coordinate system. (a) How much time elapses before the projectile is at a point 8.9 m above the ground and heading downwards toward th...

**physics**

A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?

**physics**

part B: If the river is 308 m wide, how far downstream has the boat moved by the time it reaches the north shore?

**physics**

A river flows due east at 1.65 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.7 m/s due north relative to the water. What is the velocity of the boat relative to shore?

**steve**

I keep getting the wrong answer. I got 4.42, is that wrong?

**bobpursley**

theta one goes with A and theta two goes with B. I know I'm supposed to use |A+B| =sqrt[ (A+B)x^2 + (A+B)y^2 ], but I am having troubles on which numbers I have to plug in for each value.

**physics**

of vector (A + B)

**physics**

How do I find the magnitude from this data: theta_1 = 44.9 theta_2 = 146.1 A = 4.8 cm B = 8.7 cm

**chemistry**

6.09

**3rd Grade Math Decimals**

.6 .16

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