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7. A 25 kg child slides down a 6.5 m playground slide that makes an angle of 20o with horizontal. The coefficient of kinetic friction between slide and child is 0.10.
Find the following:
a. What kind of energy is present on the child at the top of the slide? At the bottom of the slide?
b. How much potential energy does the child have?
c. How much kinetic energy does the child have?
d. How much energy is transferred to thermal energy?
e. If she starts at the top with A SPEED OF 0.50 m/s, what is her speed at the bottom?
A 200 g object is whirled in a horizontal circle with a cord of radius 1.2 m at 3rev/s. The work done in doing this is.
Which requires more work: (Body A) lifting a 50.0 kg crate a vertical distance of 2.0 meters; (Body B) lifting a 25.0 kg crate a vertical distance of 4.0 meters?
Find the sum of following vector 20.0m directed east, 12.0m directed 40° w of n and 15.0m directed 35° s of e. a.) by component method and b.) graphical method using the space of the yellow paper as the scale. Represent the given vectors and resultant’s and compare the resultant
A conductor of length l and diameter d has the value of resistance r and resistivity rho at a given temperature . if the same material for the conductor is used but of length 0.25 l and diameter 0.5d , comment on the values of resistance and resistivity
Your mother asked you to do the laundry for the day. She reminded you that some of the
clothes are used by your father in the farm. The clothes are soiled and greasy. She even
instructed you to save resources and energy because we are in a state of pandemic due
to Covid-19. As a student of Physical Science and with the knowledge on the effect of
intermolecular forces on substances, how are you going to perform the task in such a way
that energy is not wasted?
Using uncertainty principle show that an electron can't stay inside the nucleus . Radius of nucleas =5 ×10^-15
A car starts from the rest covers a distanc 500m while accelerating uniformly at 10m/s2.
Vector ⃗ has magnitude of 8units and makes an angle of 450 with the positive x-axis.
Vector ⃗⃗ also has the same magnitude of 8units and directed along the negative x-axis.
Find
a. The magnitude and direction of ⃗ ⃗⃗
A cube of mass 10kg is at rest on a horizontal surface when it is subjected to a horizontal for P that varies with time t as P=20t. If the static and kinetic coefficients of friction are both 0.4, calculate the velocity of the cube after 5s.
