Emily Grossman

Most popular questions and responses by Emily Grossman
  1. Physics

    How much work must be done to stop a 1250 kg car traveling at 105 km/h?

    asked on February 23, 2011
  2. Physics

    A 65kg trampoline artist jumps vertically upward from the top of a platform with a speed of 5.0m/s. a) How fast is he going as he lands on the trampoline, 3.0m below. b) if the trampoline behaves like a spring with a spring stiffness constant 6.2*10^4N/m,

    asked on February 23, 2011
  3. Physics

    If a curve with a radius of 88m is perfectly banked for a car traveling 75km/h, what must be the coefficient of static friction for a car not skid when traveling at 95 km/h?

    asked on February 22, 2011
  4. Physics

    A ski starts from rest and slides doen a 22 degree incline 75m long. a) if the coefficient of friction is 0.090, what is the ski's speed at the base of the incline? b). If the snow is level at the foot of the incline and has the same coefficient of

    asked on February 23, 2011
  5. Physics

    How do you solve this problem? A ball on the end of a string is revolved at a uniform rate in a vertical circle radius of 72.0 cm, as shown in figure. If its speed is 4.00m/s and its mass is .300 kg. Calculate the tension in the string when the ball is a)

    asked on February 21, 2011
  6. Physics

    How to solve/ work this problem? If a curve with a radius of 88m is perfectly banked for a car traveling 75 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 95km/h?

    asked on February 21, 2011
  7. Physics

    If a curve with a radius of 88m is perfectly banked for a car traveling 75km/h, what must be the coefficient of static friction for a car not to skid when traveling at 95km/h?

    asked on February 23, 2011
  8. Physics

    Two blocks, each of mass,m, are attached to the ends of a massless rod which pivots as shown in Fig. 8-40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system. This

    asked on March 24, 2011
  9. Physics

    A ball on the end of a string is revolved at a uniform rate in a vertical circle of radius 72.0m, as shown in figure. If it's sped is 4.00 m/s and its mass is .300kg. Calculate the tension in the string when the ball is a). at the top of its path and b).

    asked on February 22, 2011
  10. Physics

    How to solve/work problem? Two objects attract each other gravitationally with a force of 2.5 * 10^-10 N when they are .25m apart. Their total mass is 4.0kg. Find their individual masses.

    asked on February 21, 2011
  11. Chemistry

    I need help classifying these as physical and chemical properties! 1. sodium metal in chlorine gas releases luster. 2. sodium metal has a metallic silver luster. 3. sodium metal in water porduces hydrogen gas. 4. sodium metal melts to a liquid at 98

    asked on March 1, 2011
  12. Physics

    How fast (in rpm) must a centrifuge rotate if a particle 9.00cm from the axis of rotation is to experience an acceleration of 115,000g's?

    asked on February 23, 2011
  13. Physics

    How do you solve this problem? How fast (in rpm) must a centrifuge rotate if a particle 9.00cm from the axis of rotation is to experience an acceleration of 115,000 g's?

    asked on February 21, 2011
  14. Physics

    Two objects attract each other gravitionally with a force of 2.5 *10^-10 N when they are .25m apart. Their total mass is 4.0kg. Find their individual masses.

    asked on February 22, 2011
  15. chem

    I need help classifying these as physical or chemical changes! 1. sodium metal exposed to air turns dark gray. 2. steam in a test tube condenses to moisture. 3. baking soda in vinegar releases bubbles. 4. water dissolves in vinegar to give a solution. 5.

    asked on March 1, 2011
  16. Physics

    A car accelerates at a constant rate from 13m/s to 25m/s in 6.0seconds. What was its acceleration? How far did it travel in this time?

    asked on March 16, 2011
  17. Physics

    A car accelerates at a constant rate from 13m/s to 25m/s in 6.0seconds. What was its acceleration? How far did it travel in this time?

    asked on March 15, 2011
  1. Physics

    So then you have to convert it to joules?

    posted on February 24, 2011
  2. Physics

    I know that, but you like help me figure it out like what to do; please!!

    posted on February 23, 2011
  3. Physics

    Okay, thanks! I think I figured it out, if not will ask you tomorrow!!

    posted on February 22, 2011
  4. Physics

    Can you show me step by step with the numbers in there? I am confused..

    posted on February 22, 2011
  5. Physics

    So is it 2.5*10^-10(m)(4-m)/(.25)^2? Then solve from there?

    posted on February 22, 2011
  6. Physics

    So do you take 2.5*10^-10N (4.0)/.25^2?

    posted on February 22, 2011
  7. Physics

    I get what you were doing, but I still need help on how to work this one, like step by step.

    posted on February 22, 2011
  8. Physics

    How do you work this problem out??

    posted on February 22, 2011
  9. Physics

    Okay, so for a) get 3.13 and b). get 16.5?

    posted on February 22, 2011
  10. Physics

    I am confused, can someone show me how to work this problem? I really need help!

    posted on February 21, 2011
  11. Physics

    Okay, I worked them out, but I am not getting the answer they should be. Like a) i am getting as what should be the answer as b. So, i don't if someone could work them out or tell me maybe what doing wrong. Thanks!

    posted on February 21, 2011
  12. Physics

    what is the V in this case? That's what throwing me off..

    posted on February 21, 2011
  13. Physics

    Can you like work the problem out so i can see how it is done?

    posted on February 21, 2011