Answers edited by Junaid Mirza

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• A ball with a mass of #140 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #21 (kg)/s^2# and was compressed by #3/8 m# when the ball was released. How high will the ball go?
  
• Question #64d01
  
• I have confusion: 1 debye = #10^ -18# esu cm = #3.335 xx 10^30# C-m ( coulomb meter), How it is? please prove. Thanks.
  
• Question #55516
  
• How long must a simple pendulum be if it is to make exactly one swing per second?
  
• Question #164a1
  
• A person who weighs 150 pounds on Earth would weigh 67.2 pounds on Mercury. How much would a child who weighs 60 pounds on Earth weigh on Mercury?
  
• 0.5 g of a base was completely neutralised by 100 ml of 0.2 N acid. equivalent weight of the base is??
  
• Question #d7a4c
  
• What is the value for #Delta G# at 5000 K if #DeltaH# = -220 kJ/mol and #DeltaS# = -0,05 kJ/(mol*K)?
  
• Question #1471d
  
• Question #a12a9
  
• Question #8ed71
  
• A car slows down uniformly from a speed of 21.0 m/s to rest in 6.00 sec. How far did it travel in that time?
  
• How do you solve #6\sqrt{7}\times 6\sqrt{3}#?
  
• Question #ccd24
  
• What are the exact solutions of #x^2 − 3x − 7 = 0#?
  
• Gold has a density of 19.3 g/cm^3. A cube of gold measure's 4.23 cm on each edge. What is the volume of the cube?
  
• What is the equation of the line that has a slope of #4/7# and passes through (1, 3)?
  
• Question #6aae5
  
• What is the velocity of an electron that makes a transition corresponding to the longest wavelength line of the Lyman series?
  
• Question #a9c10
  
• Question #2772d
  
• What type of intermolecular force of attraction is present in the given pair of molecules, #NaCl - H_2O# ?
  
• On the moon, the acceleration due to gravity is only 1.6m/s/s downward. If someone on earth can throw a baseball 24.2 m high, how high could she throw it on the moon?
  
• An object with a mass of # 3 kg# is traveling in a circular path of a radius of #6 m#. If the object's angular velocity changes from # 6 Hz# to # 17 Hz# in #5 s#, what torque was applied to the object?
  
• pH of #0.1(M)# #NaH_2PO_4# is what?
  
• How does DNA base pairing work?
  
• Where does embryonic development occur in mammals?
  
• How do you simplify #(x-2)(x+4)(x+6)#?
  
• How do you simplify #9/ (9/8 +7)#?
  
• Question #a15e3
  
• Question #74309
  
• Question #5f601
  
• Question #1f709
  
• How many valence electrons does Ni have?
  
• Question #85f83
  
• Question #130ab
  
• Question #b1814
  
• A spring with a constant of #6/7 (kg)/s^2# is lying on the ground with one end attached to a wall. An object with a mass of #3/5 kg# and speed of #3/4 m/s# collides with and compresses the spring until it stops moving. How much will the spring compress?
  
• Question #18be7
  
• Question #fe59a
  
• An object with a mass of # 3 kg# is traveling in a circular path of a radius of #3 m#. If the object's angular velocity changes from # 4 Hz# to # 7 Hz# in # 8 s#, what torque was applied to the object?
  
• A particle of mass 100 g is fired with velocity of 20 m/s making angle 30° with horizontal. When it reaches highest point, what is the magnitude of change in momentum?
  
• Question #771b7
  
• Some very hot rocks have a temperature of #210 ^o C# and a specific heat of #150 J/(Kg*K)#. The rocks are bathed in #121 L# of boiling water. If the heat of the rocks completely vaporizes the water, what is the minimum combined mass of the rocks?
  
• An object travels North at #7 m/s# for #4 s# and then travels South at #3 m/s# for # 7 s#. What are the object's average speed and velocity?
  
• An object with a mass of # 2 kg# is traveling in a circular path of a radius of #7 m#. If the object's angular velocity changes from # 7 Hz# to # 9 Hz# in # 3 s#, what torque was applied to the object?
  
• A #100*mL# volume of #2.0*mol*L^-1# hydrochloric acid titrated a sample of metal carbonate. What is the equivalent weight of the metal?
  
• Question #b1ad6
  
• Question #22517
  
• Question #2229a
  
• Question #9524e
  
• True or false? the gravitational force between two particles depends upon the medium between the two particles. Thanks
  
• If the sperm cells of a fish have 12 chromosomes, how many chromosomes would be found in the cells forming the scales of the fish?
  
• Question #0ee53
  
• Question #964ac
  
• A projectile is shot from the ground at a velocity of #2 m/s# and at an angle of #(2pi)/3#. How long will it take for the projectile to land?
  
• Question #1be4d
  
• What is the idea of Thermal Expansion?
  
• How do you simplify #7/8*3 1/5#?
  
• The heaviest ball made by a bowling ball company weighs 16 pounds. Last week, the company shipped 10,000 of these balls. What was the total weight of the bowling balls?
  
• How does surface water move through the water cycle?
  
• Question #7fb40
  
• Calculate the enthalpy of formation of acetic acid if its anthalpy of combustion to CO2 and H2O is - 867 kJ/mol and the enthalpies of formation of CO2 and H2O are respectively - 393.5 and -285.9 kJ / mol ?
  
• A soccer ball is kicked at an angle of 45° with a speed of 20 m/s. What is the max height? How Iong does it take to reach max height? What is the hang time?
  
• A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and ball goes up to 2 m height further, find the magnitude of the force. Consider g = 10 m/s^2………[?]
  
• Question #27a97
  
• How do you solve #x^2-7x-5=0# using quadratic formula?
  
• Question #dc88f
  
• Question #f28b5
  
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