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A boy pushes horizontally with a force of 210 Newton on a 40 kilogram crate to move it across a level ground. The coefficient of kinetic friction is 0.25.
(a) Evaluate what is the magnitude of the frictional force?
N
(b) Evaluate what is the magnitude of the crate acceleration?
m/s2
A ballistic pendulum consists of a bullet (Mb=0.1kg) fired at a small wooden block (mw=0.5kg) attached to a string, 25cm long, connected to a pivot. How high does the pendulum reach above it's initial position
A magnetic field directed into the page-changes with time according to \(B = (0.05t^{2} + 0.4) T\) , where t is in s. The field has a circular cross-section of radius R = 0.05 m (Fig. 31.28). What are the magnitude and direction of the electric fi..
The temperature of 1.3 kg of water is 34° C. To cool the water, ice at 0° C is added to it. The desired final temperature of the water is 11° C. determine how much mass m of ice should be added
question1two window washers bob and joe are on a 3.00 m long 380 n scaffold supported by two cables attached to its
The function y(x, t) = (25.0 cm) cos(?x - 26?t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant
The headlights on a certain car are gauged to be 1.2 m apart. The diameter of the pupil in a human eye is 2.5 mm. What is the furthest distance at which a human eye could obviously see the headlights as 2 separate lights? Use a wavelength of 521 nm/w..
A 1000 kg experimental rocket sled on a level frictionless rail is loaded wiht 50kg of propellant. It exhausts the propellant in a 20-s "burn". If rocket, initially at rest, moves at 150m/s after the burn, what impulse is experienced by the rocket..
An electron is accelerated to speed of 1.5*10^8 m/s. at that speed, compare the relativistic results to classical results for , find the electron rest energy according to the relativistic laws
A toy car is driven by a battery of 9V. it draws a current of 2mA. what is the resistance of the car
A transformer with 2 coils wrapped around an iron core is connected to a generator and a resistor, There are 13 turns inthe primary coil and 25 in the secondary. The peak voltage inthe resistor is 63V. What is the peak emf in the generator?
If you were to build a pipe organ with open-tube pipes spanning the range of human hearing (20 Hz to 20 kHz), what would be the range of the lengths of pipes required
Parallel conducting tracks, separated by 2.79 cm, run north and south. There is a uniform magnetic field of 1.27 T pointing upward (out of the page). What is the direction of the magnetic force on the rod
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