01/19/23

A 54.0 kg pole vaulter running at 8.3 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.0 m/s and air resistance is disregarded, how high was the jump?
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01/19/23

answer in m/s, A pair of charged conducting plates produces a uniform...
A pair of charged conducting plates produces a uniform field of 12,000 N/C, directed to the right, between the plates. The separation of the plates is 40 mm. An electron is projected from plate A... more
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01/19/23

Biology question - DNA sample
You need to load 1 uL of a DNA sample onto an agarose gel. You have a tube of 6X loading dye you will use to make the sample sink into the well and be visible while it migrates. If you want to load... more
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01/19/23

Biology question - Mgcl2 stock
The MgCl2 stock we use for PCR is at 25 mM. If the molar mass of magnesium chloride is 95.211 g/mol, how many grams of MgCl2  would you need to prepare 10. mL of this 25 mM stock?A. 0.0024 g of... more
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01/19/23

biology question
To extract your DNA from your cheek cells, we prepared a solution of 0.9% NaCl (wt/vol) for you. If you start with salt crystals, how you would make 500 mL of 0.9% NaCl? A. Dissolve 9 g NaCl in... more
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01/17/23

The mass of an evacuated 245 mL flask is 143.577 g. The mass of the flask filled with 346 mbar of an unknown gas at 25 ∘C is 143.673 g. Calculate the molar mass of the unknown gas.    
Express the molar mass in grams per mole to three significant figures.
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01/17/23

A 35 kg trunk is pushed 7.2 m at constant speed up a 30° incline by a force along the plane. The coefficient of kinetic friction between the trunk and the incline is 0.25.
1) Calculate the work done by the weight of the truck2)Calculate the work done by the applied force3) How much energy was dissipated by the frictional force acting on the trunk
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01/17/23

The ∆Hvap for acetone is 29.1 kJ/mol at its boiling point of 56.2 °C. Calculate ∆E for the vaporization of one mole of acetone at this temperature.
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01/16/23

Finding Final Speed
A 730-kg car stopped at an intersection is rear-ended by a 1720-kg truck moving with a speed of 15.5 m/s.Part A: If the car was in neutral and its brakes were off, so that the collision is... more
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01/16/23

Finding Kinetic Energy Lost During A Collision
An air-track cart with mass m1= 0.35kg and initial speed v0= 0.95m/s collides with and sticks to a second cart that is at rest initially.If the mass of the second cart is m2=0.55kg, how much... more
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01/16/23

Finding Skater's Mass Using Speed
Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 65 kg skater acquires a speed of 0.64 m/s. If the speed of the other skater is 0.85 m/s, what... more
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01/16/23

Impulse On Ball
When spiking a volleyball, a player changes the velocity of the ball from 4.5 m/s to -24 m/s along a certain direction.If the impulse delivered to the ball by the player is -9.2 kg⋅m/s, what is the... more
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01/16/23

Circular Motion Practice
An 800kg roller coaster is at the top of a hill (the hill radius is 7m) moving with a speed of 4 m/s. What is the normal force on the roller coaster at this point?
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01/16/23

Circular Motion Practice
A 1,100kg car is turning on a flat roadway, moving in a circle with a radius of 12m. The car is going maximum speed through the turn without skidding. If the coefficient of friction between the car... more
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01/15/23

You need to prepare a 5% (w/v) milk solution to use in your experiment.
You need to prepare a 5% (w/v) milk solution to use in your experiment. In the lab, we have dry powdered milk that you can dissolve in your solvent (water). Describe how you would make 400 mL of a... more
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09/08/22

Two Dimensional Kinematics
The position of a particle is given by r = (at2)i + (bt3)j + (ct -2)k, where a, b, and c are constants. What is the velocity as a function of time? v(t) = ???What is the acceleration as a function... more
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08/23/22

The heat required to raise 3kg of copper from 0°C to 10°C raises 1 kg of lead from 10°C to 100°C.

If the specific heat capacity of copper is 0.095 cal/g°C, find the specific heat capacity of lead.
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08/23/22

Elon took 300g of water and supplied 8000 joules of heat to it.

What is the change in temperature of the water? (Specific heat capacity of water is 4.2 /g°C^-1)
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07/20/22

Chemistry - solve for second order constant in k(M^-1min^-1)
The following reaction 2A → B + C is second order, following the rate law Rate = k[A]². If the starting concentration [A₀] = 0.250 M, and after 215 min, [A(t)] = 0.0150 M, what is the second order... more
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07/20/22

What is the pH of a 0.520 M solution of NaCN (Ka of HCN is 4.9 × 10⁻¹⁰)?
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07/19/22

Solubility of Aluminum Hydroxide
What is the solubility of aluminum hydroxide in a buffer comprised of 0.100 M formic acid and 0.100 M sodium formate?
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07/07/22

Find Free Energy
At 725 K, ∆G° = -15.7 kJ/mol for the reaction A (g) + 2 B (g) → 3 C (g). If the partial pressures of A, B, and C are 1.21 atm, 3.25 atm, and 0.235 atm respectively, what is the free energy for this... more
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07/07/22

In mitosis, the telomeres shortern and eventually the hayflick limit takes over and the cell dies - does anything like this occur during binary fission?
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06/05/22

Can somebody please answer this question

The formula of most common monosaccharide glucose is C6H12O6, then why do the resulting disaccharide have the formula C12H22O11 rather than C12H24O12?
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06/03/22

Centripetal Acceleration

Tamir drives his car around a circular section of a road having a radius of 20 meters at a constantspeed of 10 m/s. What is the centripetal acceleration of Tamir's car?
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