• ### Kirchoff's laws problem?

1 answer · Physics · 8 months ago
• ### Physics Problem (Circular Motion)?

I had a test yesterday and this was the first question. I just wanna know if I did it right. There is one ball connected to a frictionless pivot (just something to swing from) by a string, and another ball is connected to a string that is connected to the first ball. The first ball is 1 m (radius) from the pivot, and the second ball is 2 m (radius)... show more
I had a test yesterday and this was the first question. I just wanna know if I did it right. There is one ball connected to a frictionless pivot (just something to swing from) by a string, and another ball is connected to a string that is connected to the first ball. The first ball is 1 m (radius) from the pivot, and the second ball is 2 m (radius) from the pivot. Both of the balls weight 1 kg. The velocity of the first ball is 5 m/s. The balls swing back and forth like a pendulum. What is the tension in each of the two strings?
1 answer · Physics · 10 months ago
• ### Chemistry question I got to a point where I had the grams per mole and I knew the concentration of the solution. idk what next??

Sodium carbonate exists in hydrated form, Na2CO3.xH2O, in the solid state. 3.5 g of a sodium carbonate sample was dissolved in water and the volume made up to 250 cm3. 25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl 2NaCl + CO2 + H2O
Sodium carbonate exists in hydrated form, Na2CO3.xH2O, in the solid state. 3.5 g of a sodium carbonate sample was dissolved in water and the volume made up to 250 cm3. 25.0 cm3 of this solution was titrated against 0.1 moldm-3 HCl and 24.5 cm3 of the acid were required. Calculate the value of x given the equation: Na2CO3 + 2HCl 2NaCl + CO2 + H2O
4 answers · Chemistry · 11 months ago
• ### When the following equation is balanced properly under basic conditions, what are the coefficients of the species shown?

Br- + N2H4-------NH3 + Br2 B)Water appears in the balanced equation as a --------- (reactant, product, neither) with a coefficient of --------- (Enter 0 for neither.) C)How many electrons are transferred in this reaction?
Br- + N2H4-------NH3 + Br2 B)Water appears in the balanced equation as a --------- (reactant, product, neither) with a coefficient of --------- (Enter 0 for neither.) C)How many electrons are transferred in this reaction?
1 answer · Chemistry · 11 months ago
• ### How much thermal energy is exhausted each day by this plant?

A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat produced by the combustion of coal is 3.3 × 107 J/kg. The steam that drives the turbines is at a temperature of 300◦C, and the exhaust water is at 37◦C. (a) How much thermal energy is exhausted each day by this plant? (b) How much ice at... show more
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat produced by the combustion of coal is 3.3 × 107 J/kg. The steam that drives the turbines is at a temperature of 300◦C, and the exhaust water is at 37◦C. (a) How much thermal energy is exhausted each day by this plant? (b) How much ice at -10◦C can be turned into steam at 100◦C per year by the exhaust heat from this power plant, if one collects all of energy from the exhaust heat?
1 answer · Physics · 12 months ago
• ### Find the output of the following circuit?

2 answers · Engineering · 1 year ago
• ### Data management homework?

1. In a party of 8 people, A and B refused to sit tgether or across from each other. How many ways can they be seated if there are two parallel rows of four? 2. There are 6 red marbles, 4 green and 10 blue in John's pocket. What is the probability that at least one of them is blue if John akes out 3 marbles? How would I get these?
1. In a party of 8 people, A and B refused to sit tgether or across from each other. How many ways can they be seated if there are two parallel rows of four? 2. There are 6 red marbles, 4 green and 10 blue in John's pocket. What is the probability that at least one of them is blue if John akes out 3 marbles? How would I get these?
1 answer · Mathematics · 1 year ago
• ### Politics: do you give the users with views contrary to yours a thumbs up if it's a good answer?

Or is it because of centrists that people of all view points get a thumbs up?
Or is it because of centrists that people of all view points get a thumbs up?
4 answers · Politics · 1 year ago
• ### When in physics 2x-x=2x, and x non equal 0. ? What can be x ?

5 answers · Mathematics · 1 year ago
• ### Geomtry help? easy ten points!?

I need help on this geometry question I was was assigned. Please don't just directly tell me the answer, explain everything. It would be amazing if you were to explain how I could solve this problem (what i can do to solve it). I need to calculate the area of the following quadrilateral. I'm not allowed to use a calculator, and I can't... show more
I need help on this geometry question I was was assigned. Please don't just directly tell me the answer, explain everything. It would be amazing if you were to explain how I could solve this problem (what i can do to solve it). I need to calculate the area of the following quadrilateral. I'm not allowed to use a calculator, and I can't use Heron's formula. I've been stuck on this problem for a really long time. The stuff in blue is what I've already drawn/done.
1 answer · Homework Help · 1 year ago
• ### Find the coefficient, C, of the term in the binomial expansion. Binomial        Term (x3+y)8        C⁢x12y4?

5 answers · Mathematics · 1 year ago
• ### Probability?

There are two persons, each one throws a pair of dice. Then find the probability that the throws are different?
There are two persons, each one throws a pair of dice. Then find the probability that the throws are different?
2 answers · Mathematics · 2 years ago
• ### Prove this equation can not have rational roots.?

In the equation ax^2 + bx + c = 0 a, b and c are single digit and non-negative numbers. also [abc] (a 3 digit number], is a prime number. prove that this equation can not have rational roots.
In the equation ax^2 + bx + c = 0 a, b and c are single digit and non-negative numbers. also [abc] (a 3 digit number], is a prime number. prove that this equation can not have rational roots.
3 answers · Mathematics · 2 years ago
• ### The speed of a box when it reaches the bottom of an incline plane?

A 10 kg box is placed at the top of this incline and allowed to slide down. The force of friction on the box as it travels along the surface of the incline is 11 N and the height (h) is 3.5m. Use the understanding of work and mechanical energy to find the speed of the body when it reaches the bottom.
A 10 kg box is placed at the top of this incline and allowed to slide down. The force of friction on the box as it travels along the surface of the incline is 11 N and the height (h) is 3.5m. Use the understanding of work and mechanical energy to find the speed of the body when it reaches the bottom.
1 answer · Physics · 2 years ago
• ### I need help with this problem!?

A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is μs = 0.619, the coefficient of kinetic friction is μk = 0.405, and the combined mass of the sled and its load is m = 306 kg. The ropes are separated by an angle φ = 24°, and they make an angle θ with the... show more
A heavy sled is being pulled by two people as shown in the figure. The coefficient of static friction between the sled and the ground is μs = 0.619, the coefficient of kinetic friction is μk = 0.405, and the combined mass of the sled and its load is m = 306 kg. The ropes are separated by an angle φ = 24°, and they make an angle θ with the horizontal. Assuming both ropes pull equally hard, what is the minimum rope tension required to get the sled moving? I'm having a hard time finding the θ angle, and then what process to solve. A step by step, with symbol equations, to help me understand would be appreciated. The "Figure" is of two people holding a bar that has two ropes that meet on the ends then meet at the sled at the baseon a single point. the angle going up to the people's hands is the (theta) angle and the 24(degree) angle is the one between the ropes
2 answers · Physics · 2 years ago