juanpro

This page lists questions and answers that were posted by visitors named juanpro.

Questions

The following questions were asked by visitors named juanpro.

A block of mass 2 kg is initially at rest on a horizontal surface. At time , we begin pushing on it with a horizontal force that varies with time as , where 0.6 N/s . We stop pushing at time s [ for ]. (a) First, assume the surface is frictionless. What i...

11 years ago

A merry-go-round (pictured) is sitting in a playground. It is free to rotate, but is currently stationary. You can model it as a uniform disk of mass 200 kg and radius 110 cm (consider the metal poles to have a negligible mass compared to the merry-go-rou...

11 years ago

Consider a rocket in space that ejects burned fuel at a speed of 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed of the rocket after a burn time of 155.0 s? (suppose...

11 years ago

A source of sound emits waves at a frequency 650 Hz. An observer is located at a distance 190 m from the source. Use m/s for the speed of sound. (a) Assume completely still air. How many wavefronts (full waves) are there between the source and the observe...

11 years ago

A ruler stands vertically against a wall. It is given a tiny impulse at such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that . The ruler has mass 250 g and length 30 cm....

11 years ago

A yoyo of mass 2 kg and moment of inertia 0.04 kg m consists of two solid disks of radius 0.2 m, connected by a central spindle of radius 0.15 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat...

11 years ago

For each of the following sequences, determine the value to which it converges in probability. (a) Let X1,X2,… be independent continuous random variables, each uniformly distributed between −1 and 1. Let Ui=X1+X2+⋯+Xii,i=1,2,…. What value does the sequenc...

11 years ago

Let Sn be the number of successes in n independent Bernoulli trials, where the probability of success for each trial is 1/2. Provide a numerical value, to a precision of 3 decimal places, for each of the following limits. You may want to refer to the stan...

11 years ago

Karen and Bill are rearranging furniture in their house, but they don’t always agree on where all the items should go. At one instant, Karen pushes a large chest of drawers (mass of 20kg) horizontally to the right with a force of 35N, while Bill pushes ho...

11 years ago

Samuel drops a 2kg ball from some height above the surface of a table. The ball starts from rest and loses 36 Joules of gravitational potential energy before reaching the table’s surface. What is the speed of the ball just before it hits the table? If nee...

11 years ago

A 2kg box starts from rest and slides down an incline as shown in the picture above. If the block loses 24 Joules of energy due to friction as it slides down the ramp, what is the speed of the box as it reaches the bottom of the ramp? If needed, g=10ms2

11 years ago

You release a ball from rest attached to a string as shown in Figure A. The ball swings freely, and at the bottom of its circular path it strikes a stationary block. The block slides to the left with a speed of 4ms, and the ball bounces back to the right....

11 years ago

Regarding the figure above, there are three strings tied together suspending a block at rest. Determine the tension in the horizontal string if the mass of the block is 7.5kg. If needed, g=10ms2.

11 years ago

You drop a block from rest. The block lands on the spring (spring constant = 160Nm) and compresses it .5 m before the block and spring momentarilty come to rest. (The spring then pushes the block upward.) What is the mass of the block? If needed, g=10ms2.

11 years ago

Dylan hangs a calendar on a refrigerator with a magnetic hook. Unfortunately, the magnet is too weak, so the magnet and calendar slide down the side of the refrigerator to the floor with an acceleration of magnitude 3ms2. If the coefficient of sliding fri...

11 years ago

Two pool balls, each of mass 0.2kg, collide as shown in the figure above. Before the collision, the black ball’s velocity makes an angle of 30∘ with the horizontal line. After the collision, the white ball’s velocity makes an angle of 60∘ with the vertica...

11 years ago

A small circular block of mass M traveling with a speed v on a frictionless table collides and sticks to the end of a thin rod of with length D and mass M. The picture shows a top down view of the block and rod on the frictionless table. What is the rod's...

9 years ago

Quiz 12, Problem 4 (2 points possible) A uniform rod of length d is initially at rest on a flat, frictionless table. The rod is pivoted about a point a distance d/3 from one of its ends, and is free to rotate on the table about this pivot. A small glob of...

9 years ago

This problem explores the difference between solving a circuit using the KCL/KVL method and the node method. The circuit shown below has five elements: three resistors, a current source and a voltage source. The resistance of the resistors and the strengt...

5 years ago

[4:08 p. m., 10/7/2021] Ejh: 4. Let be i.i.d. normal variable following the distribution , where is the mean and is the variance. Denote by and the maximum likelihood estimators of and respectively based on the i.i.d. observations . (In our usual notation...

4 years ago

3) As on previous let X_1….X_n be i.i.dwith pdf f_θ(x)= θx^(θ-1)1(0≤θx≤1) where θ>0 a) Assume we do not actually get to observe X_1…X_n Instead let Y_1… Y_n be our observations where Our goal is to estimate θ based on this new data. What distribution does...

4 years ago

Answers

The following answers were posted by visitors named juanpro.

no cheating is wrong?

thanks a lot you save my life

11 years ago

in numbers 256.5 and 1.71 respectively?

11 years ago

and the rotation?

11 years ago

Let us now assume that both source and observer are at rest, but wind blows at a constant speed v=20 m/s in the direction source towards observer. By comparing the difference of the rate of wavefronts leaving and wavefronts entering the region between sou...

11 years ago

could yo set numbers pleASE

11 years ago

please someone 2 hours left

11 years ago

1 c=2 2 ??? 3 d*2

11 years ago

1 hour don't torture me

11 years ago

heyyy i need a good note

please someone einstein

10 years ago

1 Given that exactly two of the six rolls resulted in a 1, find the probability that the first roll resulted in a 1. so is the solution 1/3 2 We are told that exactly three of the rolls resulted in a 1 and exactly three rolls resulted in a 2. Given this i...

5 years ago

mit2020 4a 30 =a 4b 4=b 4c 8 =c 4d 2=d