Science

PhysicsQ&A LibraryIn a downhill ski race surprisingly little advantage is gained by getting a running start. This is because the initial kinetic energy is small compared with the gain in gravitational potential energy even on small hills. To demonstrate this, find the final speed and the time taken for a skier who skies 80.0 m along a 35° slope neglecting friction for the following two cases. (Note that this time difference can be very significant in competitive events so it is still worthwhile to get a running start.) (a) starting from restfinal speed...................m/stime taken.....................s (b) starting with an initial speed of 3.00 m/s final speed..................m/stime taken .................sQuestion

In a downhill ski race surprisingly little advantage is gained by getting a running start. This is because the initial kinetic energy is small compared with the gain in gravitational potential energy even on small hills. To demonstrate this, find the final speed and the time taken for a skier who skies 80.0 m along a 35° slope neglecting friction for the following two cases. (Note that this time difference can be very significant in competitive events so it is still worthwhile to get a running start.)

(a) starting from rest

final speed

...................m/s

time taken

.....................s

(b) starting with an initial speed of 3.00 m/s

final speed

..................m/s

time taken

.................s

Find answers to questions asked by students like you.

Q: What is the energy released in this alpha decay reaction 22688Ra→22286Rn+42He88226Ra→86222Rn+24He? (...

A: The given nuclear reaction after emitting alpha particle is,

Q: Can you show me how to work this? I’m thinking I’m getting confused on the units. Thanks!

A: The ideal gas equation is,

Q: 48. A horizontal 800-N merry-go-round is a solid disk of radius 1.50 m and is started from rest by a...

A: Equations for the moment of inertia of disc about an axis passing through the centre and perpendicul...

Q: The current in a wire is directed into the page as shown to the left. The magnetic field at a point ...

A: According to Right Hand Thumb rule, if the thumb points along the direction of current, then the cur...

Q: In the figure, set R = 266 Ω, C = 54.6 μF, L = 263 mH, fd = 60.0 Hz, and εm = 7.49 V. What are (a) Z...

A: Given,

Q: Please show me how to work this. Don't round any figures please.

A: The spring constant of the spring = 1.30 kN/m.The mass of the block =215 g.The compressed distance =...

Q: A magnetic field is created in a laboratory with a field strength of 0.25t, pointing horizontal and ...

A: The force acting on a charged particle in a magnetic field can be calculated as follows.

Q: A parallel-plate capacitor has circular plates of 6.16 cm radius and 1.77 mm separation. (a) Calcula...

A: (a) For a parallel plate capacitor, the value of relative permittivity of the dielectric material(k)...

Q: Each of the eight conductors in the figure carries 6.89 A of current into or out of the page. Two pa...

A: A dot represents current coming out of the page and the cross represents current going into the page...